Condensed Consolidated Changes In Stockholders' Equity (Statement) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2019		39,251
Beginning balance at Dec. 31, 2019	$ 114,601	$ 393	$ 251,641	$ (136,473)	$ (960)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,337			3,337
Other comprehensive income (loss)	(1,434)				(1,434)
Stock option exercises and employee stock plan purchases (in shares)		33
Stock option exercises and employee stock plan purchases	366		366
Vesting of restricted stock awards and units (in shares)		563
Vesting of restricted stock awards and units	0	$ 6	(6)
Shares withheld to cover taxes (in shares)		(97)
Shares withheld to cover taxes	(1,547)	$ (1)	(1,546)
Stock-based compensation	3,075		3,075
Ending balance (in shares) at Mar. 31, 2020		39,750
Ending balance at Mar. 31, 2020	118,398	$ 398	253,530	(133,136)	(2,394)
Beginning balance (in shares) at Dec. 31, 2019		39,251
Beginning balance at Dec. 31, 2019	114,601	$ 393	251,641	(136,473)	(960)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(10,061)
Other comprehensive income (loss)	(1,550)
Ending balance (in shares) at Sep. 30, 2020		66,850
Ending balance at Sep. 30, 2020	513,579	$ 668	661,955	(146,534)	(2,510)
Beginning balance (in shares) at Mar. 31, 2020		39,750
Beginning balance at Mar. 31, 2020	118,398	$ 398	253,530	(133,136)	(2,394)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(7,012)			(7,012)
Other comprehensive income (loss)	(212)				(212)
Stock option exercises and employee stock plan purchases (in shares)		7
Stock option exercises and employee stock plan purchases	50		50
Vesting of restricted stock awards and units (in shares)		242
Vesting of restricted stock awards and units	0	$ 2	(2)
Shares withheld to cover taxes (in shares)		(36)
Shares withheld to cover taxes	(485)	$ (1)	(484)
Issuance of common stock (in shares)		26,845
Issuance of common stock, net of $3,776 issuance costs	394,334	$ 269	394,065
Fair value of replacement options related to pre-acquisition services	7,125		7,125
Stock-based compensation	3,385		3,385
Ending balance (in shares) at Jun. 30, 2020		66,808
Ending balance at Jun. 30, 2020	515,583	$ 668	657,669	(140,148)	(2,606)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(6,386)			(6,386)
Other comprehensive income (loss)	96				96
Stock option exercises and employee stock plan purchases (in shares)		32
Stock option exercises and employee stock plan purchases	344		344
Vesting of restricted stock awards and units (in shares)		13
Vesting of restricted stock awards and units	0	$ 1	(1)
Shares withheld to cover taxes (in shares)		(3)
Shares withheld to cover taxes	(50)	$ (1)	(49)
Stock-based compensation	3,992		3,992
Ending balance (in shares) at Sep. 30, 2020		66,850
Ending balance at Sep. 30, 2020	513,579	$ 668	661,955	(146,534)	(2,510)
Beginning balance (in shares) at Dec. 31, 2020		66,875
Beginning balance at Dec. 31, 2020	514,205	$ 669	665,530	(149,946)	(2,048)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	9,008			9,008
Other comprehensive income (loss)	808				808
Stock option exercises and employee stock plan purchases (in shares)		155
Stock option exercises and employee stock plan purchases	2,380	$ 1	2,379
Vesting of restricted stock awards and units (in shares)		489
Vesting of restricted stock awards and units	0	$ 5	(5)
Shares withheld to cover taxes (in shares)		(85)
Shares withheld to cover taxes	(1,599)	$ (1)	(1,598)
Stock-based compensation	3,317		3,317
Ending balance (in shares) at Mar. 31, 2021		67,434
Ending balance at Mar. 31, 2021	528,119	$ 674	669,623	(140,938)	(1,240)
Beginning balance (in shares) at Dec. 31, 2020		66,875
Beginning balance at Dec. 31, 2020	514,205	$ 669	665,530	(149,946)	(2,048)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(31,064)
Other comprehensive income (loss)	906
Ending balance (in shares) at Sep. 30, 2021		67,659
Ending balance at Sep. 30, 2021	499,344	$ 677	680,819	(181,010)	(1,142)
Beginning balance (in shares) at Mar. 31, 2021		67,434
Beginning balance at Mar. 31, 2021	528,119	$ 674	669,623	(140,938)	(1,240)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(26,657)			(26,657)
Other comprehensive income (loss)	240				240
Stock option exercises and employee stock plan purchases (in shares)		116
Stock option exercises and employee stock plan purchases	2,043	$ 1	2,042
Vesting of restricted stock awards and units (in shares)		51
Vesting of restricted stock awards and units	0	$ 1	(1)
Shares withheld to cover taxes (in shares)		(9)
Shares withheld to cover taxes	(193)		(193)
Stock-based compensation	4,588		4,588
Ending balance (in shares) at Jun. 30, 2021		67,592
Ending balance at Jun. 30, 2021	508,140	$ 676	676,059	(167,595)	(1,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(13,415)			(13,415)
Other comprehensive income (loss)	(142)				(142)
Stock option exercises and employee stock plan purchases (in shares)		48
Stock option exercises and employee stock plan purchases	961	$ 1	960
Vesting of restricted stock awards and units (in shares)		23
Shares withheld to cover taxes (in shares)		(4)
Shares withheld to cover taxes	(67)		(67)
Stock-based compensation	3,867		3,867
Ending balance (in shares) at Sep. 30, 2021		67,659
Ending balance at Sep. 30, 2021	$ 499,344	$ 677	$ 680,819	$ (181,010)	$ (1,142)