Condensed Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Convertible Senior Notes Due 2026	Convertible Senior Notes Due 2022	Cumulative effect of adoption of ASU 2020-06, net of taxes	Common Stock	Common Stock Convertible Senior Notes Due 2022	Additional Paid-in Capital	Additional Paid-in Capital Convertible Senior Notes Due 2026	Additional Paid-in Capital Convertible Senior Notes Due 2022	Additional Paid-in Capital Cumulative effect of adoption of ASU 2020-06, net of taxes	Accumulated Deficit	Accumulated Deficit Cumulative effect of adoption of ASU 2020-06, net of taxes	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2020	$ 252,305				$ 35		$ 542,776				$ (293,316)		$ 2,810
Beginning Balance, shares at Dec. 31, 2020					35,449,447
Issuance of common stock in connection with acquisition	23,032						23,032
Issuance of common stock in connection with acquisition, shares					162,820
Stock-based compensation	12,770						12,770
Vesting of restricted stock units and performance-based restricted stock units	1				$ 1
Vesting of restricted stock units and performance-based restricted stock units, shares					64,304
Shares withheld related to net share settlement of stock awards	(1,611)						(1,611)
Shares withheld related to net share settlement of stock awards, shares					(11,649)
Exercise of stock options	1,604						1,604
Exercise of stock options, shares					52,955
Issuance of shares under employee stock purchase plan	2,451						2,451
Issuance of shares under employee stock purchase plan, shares					23,499
Purchase of capped call hedge for the convertible notes due 2026, including issuance costs		$ 35,124						$ 35,124
Settlement of convertible notes due 2022			$ 15,652			$ 2			$ 15,650
Settlement of convertible notes due 2022, shares						1,870,823
Termination and modification of capped call hedge for convertible notes due 2022			$ 10,886						$ 10,886
Other comprehensive loss	(2,597)												(2,597)
Net loss	(21,789)										(21,789)
Balance at Mar. 31, 2021	356,580				$ 38		671,434				(315,105)		213
Ending Balance, shares at Mar. 31, 2021					37,612,199
Equity component of convertible notes due 2026, net of allocated issuance costs and taxes		99,000						99,000
Purchase of capped call hedge for the convertible notes due 2026, including issuance costs		$ (35,124)						$ (35,124)
Balance at Dec. 31, 2020	252,305				$ 35		542,776				(293,316)		2,810
Beginning Balance, shares at Dec. 31, 2020					35,449,447
Balance at Dec. 31, 2021	462,689			$ (137,979)	$ 39		853,664			$ (185,141)	(388,112)	$ 47,162	(2,902)
Ending Balance, shares at Dec. 31, 2021					39,389,733
Stock-based compensation	6,314						6,314
Vesting of restricted stock units and performance-based restricted stock units	1				$ 1
Vesting of restricted stock units and performance-based restricted stock units, shares					68,560
Shares withheld related to net share settlement of stock awards	(572)						(572)
Shares withheld related to net share settlement of stock awards, shares					(13,411)
Exercise of stock options	$ 17						17
Exercise of stock options, shares	725				725
Issuance of shares under employee stock purchase plan	$ 1,702						1,702
Issuance of shares under employee stock purchase plan, shares					58,747
Other comprehensive loss	(5,360)												(5,360)
Net loss	(19,073)										(19,073)
Balance at Mar. 31, 2022	$ 307,739				$ 40		$ 675,984				$ (360,023)		$ (8,262)
Ending Balance, shares at Mar. 31, 2022					39,504,354