Consolidated Statements of Changes in Mezzanine Equity and Stockholders’ Equity - USD ($) $ in Thousands	Total	Revision of Prior Period, Accounting Standards Update, Adjustment	Series A Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Revision of Prior Period, Accounting Standards Update, Adjustment	Accumulated Deficit	Accumulated Deficit Revision of Prior Period, Accounting Standards Update, Adjustment	Accumulated Other Comprehensive Income/(Loss)
Beginning balance (in shares) at Dec. 31, 2019				93,001,597
Beginning balance at Dec. 31, 2019	$ 331,446			$ 93	$ 583,097		$ (251,786)		$ 42
Increase (Decrease) in Stockholders' Equity
Issuance of common stock, net (in shares)				4,484,305
Issuance of common stock, net	69,701			$ 4	69,697
Issuance of common stock pursuant to employee stock purchase program (in shares)				186,925
Issuance of common stock pursuant to employee stock purchase program	3,436				3,436
Issuance of common stock pursuant to exercise of stock options (in shares)				1,257,830
Issuance of common stock pursuant to exercise of stock options	7,504			$ 1	7,503
Issuance of common stock pursuant to settlement of restricted stock units (in shares)				664,515
Issuance of common stock pursuant to settlement of restricted stock units				$ 1	(1)
Common stock surrendered for employees' tax liability upon settlement of restricted stock units (in shares)				(200,740)
Common stock surrendered for employees' tax liability upon settlement of restricted stock units	(6,065)				(6,065)
Stock-based compensation	15,567				15,567
Other comprehensive loss	399								399
Net loss	(66,728)						(66,728)
Ending balance (in shares) at Jun. 30, 2020				99,394,432
Ending balance at Jun. 30, 2020	$ 355,260			$ 99	673,234		(318,514)		441
Beginning balance (in shares) at Dec. 31, 2019			0
Beginning balance at Dec. 31, 2019			$ 0
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of convertible preferred stock, net (in shares)	40,000
Issuance of convertible preferred stock, net	$ 39,801
Ending balance (in shares) at Jun. 30, 2020			40,000
Ending balance at Jun. 30, 2020			$ 39,801
Beginning balance (in shares) at Mar. 31, 2020				93,957,774
Beginning balance at Mar. 31, 2020	280,186			$ 94	591,420		(311,903)		575
Increase (Decrease) in Stockholders' Equity
Issuance of common stock, net (in shares)				4,484,305
Issuance of common stock, net	69,701			$ 4	69,697
Issuance of common stock pursuant to employee stock purchase program (in shares)				186,925
Issuance of common stock pursuant to employee stock purchase program	3,436				3,436
Issuance of common stock pursuant to exercise of stock options (in shares)				519,432
Issuance of common stock pursuant to exercise of stock options	3,589			$ 1	3,588
Issuance of common stock pursuant to settlement of restricted stock units (in shares)				344,075
Common stock surrendered for employees' tax liability upon settlement of restricted stock units (in shares)				(98,079)
Common stock surrendered for employees' tax liability upon settlement of restricted stock units	(2,758)				(2,758)
Stock-based compensation	7,851				7,851
Other comprehensive loss	(134)								(134)
Net loss	(6,611)						(6,611)
Ending balance (in shares) at Jun. 30, 2020				99,394,432
Ending balance at Jun. 30, 2020	$ 355,260			$ 99	673,234		(318,514)		441
Beginning balance (in shares) at Mar. 31, 2020			0
Beginning balance at Mar. 31, 2020			$ 0
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of convertible preferred stock, net (in shares)	40,000
Issuance of convertible preferred stock, net	$ 39,801
Ending balance (in shares) at Jun. 30, 2020			40,000
Ending balance at Jun. 30, 2020			$ 39,801
Beginning balance (in shares) at Dec. 31, 2020	103,000,594			103,000,594
Beginning balance at Dec. 31, 2020	$ 590,557	$ (162,478)		$ 103	860,556	$ (170,240)	(270,313)	$ 7,762	211
Increase (Decrease) in Stockholders' Equity
Common Stock Dividends, Shares				61,280
Issuance of common stock pursuant to employee stock purchase program (in shares)				135,426
Issuance of common stock pursuant to employee stock purchase program	$ 7,299				7,299
Issuance of common stock pursuant to exercise of stock options (in shares)	1,089,203			1,089,203
Issuance of common stock pursuant to exercise of stock options	$ 5,200			$ 1	5,199
Issuance of common stock pursuant to settlement of restricted stock units (in shares)				738,095
Issuance of common stock pursuant to settlement of restricted stock units	0			$ 1	(1)
Common stock surrendered for employees' tax liability upon settlement of restricted stock units (in shares)				(224,107)
Common stock surrendered for employees' tax liability upon settlement of restricted stock units	(16,530)				(16,530)
Purchases of capped calls related to convertible senior notes	(62,647)				(62,647)
Issuance of common stock in connection with conversion of convertible senior notes (in shares)				37,604
Issuance of common stock in connection with conversion of convertible senior notes	53				53
Stock-based compensation	28,044				28,044
Other comprehensive loss	(134)								(134)
Net loss	$ (63,662)						(63,662)
Ending balance (in shares) at Jun. 30, 2021	104,838,095			104,838,095
Ending balance at Jun. 30, 2021	$ 325,596			$ 105	651,627		(326,213)		77
Beginning balance (in shares) at Dec. 31, 2020	40,000		40,000
Beginning balance at Dec. 31, 2020	$ 39,823		$ 39,823
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of convertible preferred stock, net (in shares)	0
Issuance of convertible preferred stock, net	$ 23
Ending balance (in shares) at Jun. 30, 2021	40,000		40,000
Ending balance at Jun. 30, 2021	$ 39,846		$ 39,846
Beginning balance (in shares) at Mar. 31, 2021				103,983,585
Beginning balance at Mar. 31, 2021	343,632			$ 104	641,702		(298,335)		161
Increase (Decrease) in Stockholders' Equity
Common Stock Dividends, Shares				30,640
Issuance of common stock pursuant to employee stock purchase program (in shares)				135,426
Issuance of common stock pursuant to employee stock purchase program	7,299				7,299
Issuance of common stock pursuant to exercise of stock options (in shares)				419,153
Issuance of common stock pursuant to exercise of stock options	1,737			$ 1	1,736
Issuance of common stock pursuant to settlement of restricted stock units (in shares)				377,744
Common stock surrendered for employees' tax liability upon settlement of restricted stock units (in shares)				(109,077)
Common stock surrendered for employees' tax liability upon settlement of restricted stock units	(5,670)				(5,670)
Purchases of capped calls related to convertible senior notes	(8,168)				(8,168)
Issuance of common stock in connection with conversion of convertible senior notes (in shares)				624
Issuance of common stock in connection with conversion of convertible senior notes	(1)				(1)
Stock-based compensation	14,729				14,729
Other comprehensive loss	(84)								(84)
Net loss	$ (27,878)						(27,878)
Ending balance (in shares) at Jun. 30, 2021	104,838,095			104,838,095
Ending balance at Jun. 30, 2021	$ 325,596			$ 105	$ 651,627		$ (326,213)		$ 77
Beginning balance (in shares) at Mar. 31, 2021			40,000
Beginning balance at Mar. 31, 2021			$ 39,834
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of convertible preferred stock, net	$ 0		$ 12
Ending balance (in shares) at Jun. 30, 2021	40,000		40,000
Ending balance at Jun. 30, 2021	$ 39,846		$ 39,846