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Warrants (Tables) | 6 Months Ended
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Jun. 30, 2017
Warrants and Rights Note Disclosure [Abstract] |
Schedule of Warrant Activity | The following is a summary of warrant activity for the six months ended June 30, 2017 (in thousands):
Warrant Issuance | Outstanding, December 31, 2016 |  | Granted |  | Exercised |  | Expired |  | Outstanding, June 30 2017 |  | Expiration
February 2017 | — |  |  | 17,000 |  |  | — |  |  | — |  |  | 17,000 |  |  | February 2022
July 2016 | 700 |  |  | — |  |  | — |  |  | — |  |  | 700 |  |  | January 2022
January 2016 | 682 |  |  | — |  |  | — |  |  | — |  |  | 682 |  |  | January 2021
March 2015 | 700 |  |  | — |  |  | — |  |  | — |  |  | 700 |  |  | March 2020
September 2013 | 199 |  |  | — |  |  | — |  |  | — |  |  | 199 |  |  | September 2018
December 2012 | 152 |  |  | — |  |  | — |  |  | — |  |  | 152 |  |  | December 2017
April 2011 | 13 |  |  | — |  |  | — |  |  | (13 | ) |  | — |  |  | April 2017
Other | 124 |  |  | — |  |  | — |  |  | — |  |  | 124 |  |  | November 2021
| 2,570 |  |  | 17,000 |  |  | — |  |  | (13 | ) |  | 19,557 |  |  |
Fair Value of Warrants is Estimated Using Black-Scholes Option Pricing Model | The fair value of the warrants is estimated using an appropriate pricing model with the following inputs:
As of June 30, 2017
Warrant Issuance | Outstanding (in thousands) |  | Strike price (per share) |  | Expected term (years) |  | Volatility % |  | Risk-free rate %
February 2017 | 17,000 |  |  | $ | 1.10 |  |  | 4.62 |  | 136.07 | % |  | 1.83 | %
July 2016 | 700 |  |  | $ | 13.00 |  |  | 4.04 |  | 144.12 | % |  | 1.73 | %
January 2016 | 682 |  |  | $ | 28.40 |  |  | 3.53 |  | 150.15 | % |  | 1.64 | %
March 2015 | 700 |  |  | $ | 41.60 |  |  | 2.72 |  | 168.20 | % |  | 1.50 | %
September 2013 | 199 |  |  | $ | 50.00 |  |  | 1.22 |  | 100.31 | % |  | 1.27 | %
December 2012 | 152 |  |  | $ | 10.32 |  |  | 0.48 |  | 49.17 | % |  | 1.13 | %
As of December 31, 2016
Warrant Issuance | Outstanding (in thousands) |  | Strike price (per share) |  | Expected term (years) |  | Volatility % |  | Risk-free rate %
July 2016 | 700 |  |  | $ | 13.00 |  |  | 4.54 |  | 117.82 | % |  | 1.82 | %
January 2016 | 682 |  |  | $ | 28.40 |  |  | 4.03 |  | 120.38 | % |  | 1.71 | %
March 2015 | 700 |  |  | $ | 41.60 |  |  | 3.22 |  | 131.46 | % |  | 1.52 | %
September 2013 | 199 |  |  | $ | 50.00 |  |  | 1.72 |  | 164.01 | % |  | 1.10 | %
December 2012 | 152 |  |  | $ | 31.60 |  |  | 0.98 |  | 204.55 | % |  | 0.84 | %
April 2011 | 13 |  |  | $ | 13.00 |  |  | 0.31 |  | 103.79 | % |  | 0.53 | %
Changes in Fair Value of Warrant Liability | The changes in fair value of the warrant liability for the six months ended June 30, 2017 were as follows (in thousands):
Warrant Issuance | Warrant liability, December 31, 2016 |  | Fair value of warrants granted |  | Fair value of warrants exercised |  | Change in fair value of warrants |  | Warrant liability, June 30, 2017
February 2017 | $ | — |  |  | $ | 10,357 |  |  | $ | — |  |  | $ | (2,345 | ) |  | $ | 8,012 |
July 2016 | 753 |  |  | — |  |  | — |  |  | (540 | ) |  | 213 |
January 2016 | 529 |  |  | — |  |  | — |  |  | (375 | ) |  | 154 |
March 2015 | 432 |  |  | — |  |  | — |  |  | (301 | ) |  | 131 |
September 2013 | 81 |  |  | — |  |  | — |  |  | (81 | ) |  | — |
December 2012 | 65 |  |  | — |  |  | — |  |  | (65 | ) |  | — |
April 2011 | — |  |  | — |  |  | — |  |  | — |  |  | — |
| $ | 1,860 |  |  | $ | 10,357 |  |  | $ | — |  |  | $ | (3,707 | ) |  | $ | 8,510 |

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