CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (19,765)	$ (8,322)	$ (30,338)	$ (15,785)
Other comprehensive income, net of tax
Foreign currency translation adjustment, net of income tax benefit (expense) of $28 and $(2) for the three months ended June 30, 2020 and 2019, respectively, and net of income tax benefit (expense) of $28 and $(5) for the six months ended June 30, 2020 and 2019, respectively	(30)	6	(81)	15
Unrealized gain on available-for-sale securities, net of income tax benefit (expense) of $(159) and $(26) for the three months ended June 30, 2020 and 2019, respectively, and net of income tax benefit (expense) of $(159) and $(41) for the six months ended June 30, 2020 and 2019, respectively	420	76	462	119
Other comprehensive income, net of tax	390	82	381	134
Comprehensive loss	$ (19,375)	$ (8,240)	$ (29,957)	$ (15,651)