Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Preferred Stock
Issuance costs			$ 9,000
Redeemable Convertible Preferred Stock Series A | Preferred Stock
Convertible Notes Payable	$ 2,929,000
Tranche Rights	2,600,000
Issuance costs	$ 22,000	$ 1,000
Redeemable Convertible Preferred Stock Series B
Issuance costs		220,000
Redeemable Convertible Preferred Stock Series B | Preferred Stock
Issuance costs		220,000
Discount		$ 5,000,000