Convertible Preferred Stock Warrants and Common Stock Warrants (Tables)

12 Months Ended

Dec. 31, 2017

Warrants And Rights Note Disclosure [Abstract]

Schedule of Warrants Issued and Outstanding

At December 31, 2015 and 2016, the Company had the following Series B-1 convertible preferred stock warrants issued and outstanding (in thousands, except share and per share data):

	Shares				Fair Value
Warrant Class	2015		2016		2015		2016		Issuance Date	Price per Share		Expiration Date
Series B-1		25,568		25,568	$	142	$	303	June 2012	$	5.8667	June 2022
Series B-1		167,428		167,428	$	124	$	263	July 2012	$	5.8667	July 2019
Series B-1		145,801		145,801	$	22	$	46	August 2012	$	5.8667	August 2019
Series B-1		10,517		10,517	$	9	$	19	November 2012	$	5.8667	November 2022
Series B-1		156,851		156,851	$	907	$	929	February 2014	$	0.1700	February 2021
Series B-1		173,862		173,862	$	147	$	315	September 2015	$	5.8667	September 2025
Total		680,027		680,027	$	1,351	$	1,875

At December 31, 2017, the Company had the following common stock warrants issued and outstanding:

Warrant Class	Shares		Issuance Date	Price per Share		Expiration Date
Common stock warrant		165,925	July 2012	$	5.8667	July 2019
Common stock warrant		61,502	August 2012	$	5.8667	August 2019
Common stock warrant		156,851	February 2014	$	0.1700	February 2021
Common stock warrant (1)		84,000	June 2017	$	13.2000	June 2020
		468,278

(1) This warrant was issued to the Company’s lead underwriter in connection with the IPO.