Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2016	Dec. 31, 2015
Preferred Stock
Issuance costs			$ 9
Redeemable Convertible Preferred Stock Series A | Preferred Stock
Convertible Notes Payable	$ 2,929
Tranche Rights	2,600
Issuance costs	$ 22	$ 1
Redeemable Convertible Preferred Stock Series B
Issuance costs		200
Redeemable Convertible Preferred Stock Series B | Preferred Stock
Issuance costs		220
Discount		$ 5,000