Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Cash Flows (Unaudited)

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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities    
Net income $ 5,302 $ 10,758
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 2,794 2,993
Loss on rental units and other fixed assets 171 284
Gain on sale of former rental assets (21) (401)
Provision for sales revenue returns and doubtful accounts 4,428 4,920
Provision for rental revenue adjustments 590 719
Provision for inventory losses 456 73
Stock-based compensation expense 3,586 3,381
Deferred income taxes 834 (1,798)
Changes in operating assets and liabilities:    
Accounts receivable (9,517) (9,206)
Inventories (2,897) (4,327)
Deferred cost of revenue 13 26
Income tax receivable 100 726
Prepaid expenses and other current assets (2,156) (1,192)
Operating lease right-of-use asset (5,936)  
Other noncurrent assets (491)  
Accounts payable and accrued expenses (1,974) 3,928
Accrued payroll (3,572) (274)
Warranty reserve 227 1,074
Deferred revenue 367 608
Income tax payable (277) (36)
Operating lease liability 6,981  
Other noncurrent liabilities (832) (16)
Net cash provided by (used in) operating activities (1,824) 12,240
Cash flows from investing activities    
Purchases of marketable securities (19,033) (11,565)
Maturities of marketable securities 13,750 8,525
Investment in property and equipment (933) (2,075)
Production and purchase of rental equipment (781) (1,447)
Proceeds from sale of former assets 49 573
Net cash used in investing activities (6,948) (5,989)
Cash flows from financing activities    
Proceeds from stock options exercised 1,635 4,459
Proceeds from employee stock purchases 1,525 988
Payment of employment taxes related to release of restricted stock (714) (302)
Net cash provided by financing activities 2,446 5,145
Effect of exchange rates on cash (72) (65)
Net increase (decrease) in cash and cash equivalents (6,398) 11,331
Cash and cash equivalents, beginning of period 196,634 142,953
Cash and cash equivalents, end of period 190,236 154,284
Supplemental disclosures of cash flow information    
Cash paid (received) during the period for income taxes, net of refunds received 214 (14)
Supplemental disclosure of non-cash transactions    
Property and equipment in accounts payable and accrued liabilities $ 194 $ 93