Related Party Transactions - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	May 04, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 11, 2016	Apr. 30, 2016	Jan. 31, 2015
Related Party Transaction [Line Items]
Customer deposit from related party		$ 0	$ 1,283
Convertible preferred stock, shares issued					10,096,639
Series D Convertible Preferred Stock
Related Party Transaction [Line Items]
Issuance for common stock for cash (in shares)				2,732,552
Revenue from related parties as percentage of total revenue		100.00%	94.70%	52.40%
Convertible preferred stock, shares issued		0	2,732,552		2,732,552
Convertible preferred stock, par value (in dollars per share)		$ 0.001	$ 0.001
Series E Convertible Preferred Stock
Related Party Transaction [Line Items]
Issuance for common stock for cash (in shares)		1,916,425
Proceeds from issuance of convertible preferred stock	$ 15,800
Convertible preferred stock, shares issued	1,916,425	0	0		1,916,425
Convertible preferred stock, par value (in dollars per share)		$ 0.001	$ 0.001
Bader
Related Party Transaction [Line Items]
Accounts receivable from related party		$ 500
Customer deposit from related party							$ 1,300
Bader | Series D Convertible Preferred Stock
Related Party Transaction [Line Items]
Issuance for common stock for cash (in shares)		875,903
Proceeds from issuance of convertible preferred stock		$ 3,400	$ 3,800	$ 1,900
Bader | Series E Convertible Preferred Stock | Distribution Agreement
Related Party Transaction [Line Items]
Convertible preferred stock, shares issued						154,585
Convertible preferred stock, par value (in dollars per share)						$ 8.2932