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Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2020

Stockholders' Equity [Abstract]

Summary of Stock Option Activity

		Stock Options Outstanding
							Weighted
		Number					average
		of shares		Exercise price			exercise price
Balances, December 31, 2019		22,697		$	1.16 – 16.00		$	5.57
Options granted		35			2.45			2.45
Options exercised		(67)			1.16 – 4.25			3.00
Options canceled		(980)			2.54 – 15.77			7.80
Balances, March 31, 2020		21,685		$	1.16 – 16.00		$	5.48

Summary of Time-Based RSUs Activity

			Weighted average
	Number		grant date
	of shares		fair value
RSUs outstanding at December 31, 2019	1,086		$	6.12
RSUs granted	4,960			4.41
RSUs released	(850)			6.79
RSUs forfeited	(115)			4.82
Unvested RSUs outstanding at March 31, 2020	5,081		$	4.36

Summary of Performance-Based RSUs Activity

			Weighted average
	Number		grant date
	of shares		fair value
PSUs outstanding at December 31, 2019	138		$	2.63
PSUs granted	—			—
PSUs released	—			—
PSUs forfeited	—			—
Unvested PSUs outstanding at March 31, 2020	138		$	2.63

Schedule of Stock-Based Compensation Expense

	Three Months Ended March 31,
	2020			2019
Cost of revenue	$	527		$	512
Research and development		1,759			2,012
Sales, general and administrative		1,746			1,857
Total stock-based compensation expense	$	4,032		$	4,381

Schedule of Fair Value of Employee Stock Options

	Three Months Ended March 31,
Stock Option	2020		2019
Expected term in years	5.1		—
Expected volatility	57%		—
Risk-free interest rate	1.2%		—
Dividend yield	—		—

Schedule of Fair Value of Employee Stock Purchase Plan

	Three Months Ended March 31,
ESPP	2020		2019
Expected term in years	0.5-2.0		—
Expected volatility	57%		—
Risk-free interest rate	0.8%-1.0%		—
Dividend yield	—		—

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