Annual report pursuant to Section 13 and 15(d)

Schedule II: Valuation and Qualifying Accounts (Details)

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Schedule II: Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Doubtful Accounts      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance Beginning of Year $ 1,664 $ 1,180 $ 1,141
Additions 3,580 2,680 1,692
Deletions 2,575 2,196 1,404
Adjustments (800)   (249)
Balance at End of Year 1,869 1,664 1,180
Allowance for Sales Returns      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance Beginning of Year 366 173 134
Additions 7,502 4,918 3,451
Deletions 7,283 4,725 3,412
Balance at End of Year 585 366 173
Allowance for Rental Revenue Adjustments      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance Beginning of Year 4,115 2,392 2,115
Additions 10,777 8,543 8,267
Deletions 9,614 6,820 8,239
Adjustments 800   249
Balance at End of Year 6,078 4,115 2,392
Allowance for Inventory Reserves      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance Beginning of Year 128 141 100
Additions 133 89 201
Deletions 70 102 160
Balance at End of Year 191 128 141
Allowance for Rental Asset Loss      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance Beginning of Year 850 832 157
Additions 455 498 1,443
Deletions 580 480 768
Balance at End of Year $ 725 $ 850 $ 832