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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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