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Summary of Significant Accounting Polices - Net Loss Per Share thru Recent Accounting Pronouncements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Anti-dilutive securities
Anti-dilutive securities excluded from the calculation of diluted net loss per share (in shares)	1,782,959	9,286,250	8,894,712
Recent Accounting Pronouncements
Other non-current assets	$ 22,000	$ 541,000
Prepaid Expenses and Other Current Assets | Proforma Adjustment | Accounting Standards Update 2015-03
Recent Accounting Pronouncements
Deferred financing costs, net	32,000	39,000
Notes Payable | Proforma Adjustment | Accounting Standards Update 2015-03
Recent Accounting Pronouncements
Other non-current assets	21,000	49,000
Notes Payable, Noncurrent | Accounting Standards Update 2015-03
Recent Accounting Pronouncements
Other non-current assets	$ 21,000
Notes Payable, Noncurrent | Proforma Adjustment | Accounting Standards Update 2015-03
Recent Accounting Pronouncements
Other non-current assets		$ 49,000
Convertible preferred stock
Anti-dilutive securities
Anti-dilutive securities excluded from the calculation of diluted net loss per share (in shares)		8,012,988	8,012,988
Warrants for the purchase of Common Stock
Anti-dilutive securities
Anti-dilutive securities excluded from the calculation of diluted net loss per share (in shares)	59,405	34,839	34,839
Options to purchase Common Stock
Anti-dilutive securities
Anti-dilutive securities excluded from the calculation of diluted net loss per share (in shares)	1,723,554	1,226,140	846,885
Warrants for the purchase of Preferred Stock | Convertible preferred stock warrants
Anti-dilutive securities
Anti-dilutive securities excluded from the calculation of diluted net loss per share (in shares)		12,283

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