Stockholders’ Equity - Warrants (Details) - USD ($)	1 Months Ended		12 Months Ended
	Jun. 30, 2015	Feb. 28, 2014	Dec. 31, 2016	Dec. 31, 2015	Oct. 07, 2016	Dec. 31, 2010
Warrants
Loss from remeasurement			$ (372,000)	$ (15,000)
Warrants to Purchase Series A Redeemable Convertible Preferred Stock | SVB Credit Facility
Warrants
Number of shares the warrant can be converted to						3,076
Warrant exercise price						$ 26.00
Debt discount						$ 63,000
Fair Value Of Warrants			1,600
Additional paid in capital			1,600
Warrants to Purchase Series A Redeemable Convertible Preferred Stock | SVB Credit Facility | Common Stock
Warrants
Number of shares the warrant can be converted to					3,076
Warrants to Purchase Series B Redeemable Convertible Preferred Stock | 2015 Credit Facility
Warrants
Number of shares the warrant can be converted to	18,461
Warrant exercise price	$ 26.00
Fair Value Of Warrants	$ 307,000		48,900
Warrant exercise expiration period	10 years
Additional paid in capital			48,900
Warrants to Purchase Series B Redeemable Convertible Preferred Stock | 2015 Credit Facility | Common Stock
Warrants
Number of shares the warrant can be converted to	18,461
Warrants to Purchase Series B Redeemable Convertible Preferred Stock | SVB Credit Facility
Warrants
Number of shares the warrant can be converted to		6,153
Warrant exercise price		$ 26.00
Fair Value Of Warrants		$ 106,000	14,900
Warrant exercise expiration period		10 years
Additional paid in capital			$ 14,900
Warrants to Purchase Series B Redeemable Convertible Preferred Stock | SVB Credit Facility | Common Stock
Warrants
Number of shares the warrant can be converted to					6,153