Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments - Summary of Components of Accumulated Other Comprehensive Income (Loss) (Details)

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Fair Value of Financial Instruments - Summary of Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     $ 724  
Other comprehensive income $ (207) $ 715 (71) $ 727
Ending Balance 653   653  
Beginning Balance 321,894 246,337 310,424 227,041
Ending Balance 333,798 266,906 333,798 266,906
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     394  
Other comprehensive income     (31)  
Ending Balance 363   363  
Unrealized Gains on Marketable Securities        
Accumulated Other Comprehensive Income Loss [Line Items]        
Other comprehensive income     36  
Ending Balance 36   36  
Unrealized Gains (Losses) on Cash Flow Hedges        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     330  
Other comprehensive income     (76)  
Ending Balance 254   254  
Accumulated other comprehensive income        
Accumulated Other Comprehensive Income Loss [Line Items]        
Other comprehensive income (207) 715 (71) 727
Beginning Balance 860 284 724 272
Ending Balance $ 653 $ 999 $ 653 $ 999