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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Stockholders' Equity [Abstract]

Summary of Stock Option Activity



		Stock Options Outstanding
		Number					Weighted average
		of shares		Exercise price			exercise price
Balances, December 31, 2018		25,176		$	1.16 – 16.00		$	5.66
Additional shares reserved
Options granted		—			—			—
Options exercised		(1,199)		$	1.16 – 7.05		$	4.78
Options canceled		(1,280)		$	2.54 – 16.00		$	8.01
Balances, December 31, 2019		22,697		$	1.16 – 16.00		$	5.57



Reconciliation of Outstanding and Exercisable Stock Options



			Options Outstanding							Options Exercisable
					Weighted average
			Number		remaining contractual		Weighted average			Number		Weighted average
	Exercise price		outstanding		life (Years)		exercise price			vested		exercise price
	$	0.00 – 1.60	414,207		2.87		$	1.18		414,207		$	1.18
	$	1.60 – 3.20	5,720,080		6.38		$	2.54		3,680,040		$	2.54
	$	3.20 – 4.80	3,110,896		3.88		$	4.02		2,858,193		$	4.02
	$	4.80 – 6.40	5,935,013		6.12		$	5.46		4,895,635		$	5.46
	$	6.40 – 8.00	2,554,434		5.19		$	7.21		2,525,441		$	7.21
	$	8.00 – 9.60	3,061,742		4.63		$	8.77		2,938,483		$	8.77
	$	9.60 – 11.20	1,224,700		4.94		$	10.20		1,224,700		$	10.20
	$	11.20 – 12.80	423,252		1.08		$	12.10		423,252		$	12.10
	$	12.80 – 14.40	163,250		1.00		$	13.71		163,210		$	13.71
	$	14.40 – 16.00	89,000		0.80		$	15.99		89,000		$	15.99
			22,696,574		5.30		$	5.57		19,212,161		$	5.90




Summary of Time-Based RSUs Activity


			Weighted average
	Number		grant date
	of shares		fair value
RSUs outstanding at December 31, 2018	371		$	3.20
RSUs granted	900			7.06
RSUs vested	(127)			4.35
RSUs forfeited	(58)			5.86
Unvested RSUs outstanding at December 31, 2019	1,086		$	6.12



Summary of Performance-Based RSUs Activity


			Weighted average
	Number		grant date
	of shares		fair value
PSUs outstanding at December 31, 2018	586		$	2.58
PSUs granted	—			—
PSUs vested	(204)			2.57
PSUs forfeited	(244)			2.57
Unvested PSUs outstanding at December 31, 2019	138		$	2.63



Schedule of Stock-Based Compensation Expense



	Years Ended December 31,
	2019			2018			2017
Cost of revenue	$	1,857		$	3,124		$	2,311
Research and development		7,699			10,076			8,506
Sales, general and administrative		6,845			9,953			9,535
Total stock-based compensation expense	$	16,401		$	23,153		$	20,352



Schedule of Fair Value of Employee Stock Options



		Years Ended December 31,
		2019			2018			2017
Expected term (years)			—			5.2 years			6.1 years
Expected volatility			—			66.8%			70.0%
Risk-free interest rate			—			2.6%			2.1%
Dividend yield			—			—			—




Schedule of Fair Value of Employee Stock Purchase Plan



		Years Ended December 31,
		2019			2018			2017
Expected term (years)			—			0.5 - 2.0			0.5 - 2.0
Expected volatility			—			65% - 67%			70.0%
Risk-free interest rate			—			1.3%-2.7%			0.8%-1.4%
Dividend yield			—			—			—



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