Capital Stock (Tables)

12 Months Ended

Dec. 31, 2017

Stockholders Equity Note [Abstract]

Schedule of Stock by Class

Immediately prior to the IPO, the Company had the following outstanding convertible preferred stock:

	Shares Authorized		Shares Issued and Outstanding		Aggregate Liquidation Preference (in thousands)
Series B-1		4,773,000		3,848,023	$	22,575
Series A-2		1,177,000		1,176,423		20,000
					$	42,575

Schedule of Common Stock Reserved for Future Issuance

At December 31, 2016, shares of common stock reserved for future issuance were as follows:

	December 31,
	2016
Conversion of Series B-1 convertible preferred stock		3,848,023
Conversion of Series A-2 convertible preferred    stock(1)		841,730
Conversion of Series B-1 convertible preferred stock    warrants		680,027
Total conversion of convertible preferred stock    and warrants		5,369,780
Options outstanding		1,130,141
Shares available for future grant		390,164
Total		6,890,085

(1) Reflects the effect of an amendment and restatement of the Company’s amended and restated certificate of incorporation in March 2017 to implement a conversion feature for the Series A-2 convertible preferred stock.

At December 31, 2017, shares of common stock reserved for future issuance were as follows:

	December 31,
	2017
Options outstanding		1,294,128
Shares available for future grant		1,003,875
Unvested restricted stock units		47,312
Warrants to purchase common stock		468,278
Total		2,813,593