Changes in Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2020

Stockholders Equity Note [Abstract]

Summary of Changes in Stockholders' Equity

The following tables summarize the changes in stockholders’ equity for the three months ended March 31, 2020 and 2019.

	Common Stock, $0.001 Par Value				Additional Paid-In		Accumulated Other Comprehensive			Accumulated
	Shares		Amount		Capital		Income (Loss)			Deficit			Total
Balances at December 31, 2019		42,955	$	44	$	1,048,380	$	(336	)	$	(398,130	)		649,958
Issuance of common stock under stock    plans, net of shares withheld for    employee taxes		411		—		1,320		—			—			1,320
Stock-based compensation		—		—		27,905					—			27,905
Cumulative translation adjustment		—		—		—		(1,077	)		—			(1,077	)
Unrealized gain on investments, net of income taxes of $0		—		—		—		583			—			583
Net loss		—		—		—		—			(17,716	)		(17,716	)
Balances at March 31, 2020		43,366	$	44	$	1,077,605	$	(830	)	$	(415,846	)	$	660,973

	Common Stock, $0.001 Par Value				Additional Paid-In		Accumulated Other Comprehensive			Accumulated
	Shares		Amount		Capital		Income (Loss)			Deficit			Total
Balances at December 31, 2018		39,300	$	40	$	589,708	$	(723	)	$	(344,384	)	$	244,641
Issuance of common stock under stock    plans, net of shares withheld for    employee taxes		440		1		1,161		—			—			1,162
Issuance of common stock in relation to    common stock offering, net of offering costs    incurred $365		2,151		2		342,628		—			—			342,630
Stock-based compensation		—		—		21,548					—			21,548
Cumulative translation adjustment		—		—		—		(304	)		—			(304	)
Unrealized gain on investments, net of income    taxes of $113		—		—		—		426			—			426
Net loss		—		—		—		—			(11,100	)		(11,100	)
Balances at March 31, 2019		41,891	$	43	$	955,045	$	(601	)	$	(355,484	)	$	599,003