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Stockholders' Equity (Additional Information) (Details) - USD ($) |  |  |  |  | 6 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 13, 2017 | Dec. 04, 2015 | Nov. 18, 2014 | May 24, 2013 | Jun. 30, 2017 | Jun. 30, 2016 | Feb. 06, 2017 | Dec. 31, 2016 | Jul. 29, 2016 | Jun. 28, 2016 | May 10, 2016 | Jan. 12, 2016 | May 08, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  | 5,000,000 |  |  | 5,000,000 |  |  |  |  |
Preferred stock, par value (usd per share) |  |  |  |  | $ 0.0001 |  |  | $ 0.0001 |  |  |  |  |
Common stock, shares authorized |  |  |  |  | 350,000,000 |  |  | 350,000,000 |  |  |  |  |
Common stock, par value (usd per share) |  |  |  |  | $ 0.0001 |  |  | $ 0.0001 |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  |  |  | $ 5,000 | $ 78,000 |  |  |  |  |  |  |
Exercise price (usd per share) |  |  |  |  | $ 79.40 |  |  | $ 79.40 | $ 8.60 | $ 8.60 | $ 30.20 |  | $ 49.40
Lincoln Park Capital, LLC Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  | $ 4,900,000 |  |  |  |  |  |  |  |  |  |
Purchase Agreement Term |  |  | 36 months |  |  |  |  |  |  |  |  |  |
Stock issued during period related to purchase of assets |  |  | 125,000 |  |  |  |  |  |  |  |  |  |
Share Price |  |  | $ 40.00 |  |  |  |  |  |  |  |  |  |
Remaining authorized repurchase amount |  |  |  |  |  |  | $ 2,100,000 |  |  |  |  |  |
MLV & Co. LLC and Maxim Group LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining authorized repurchase amount |  | $ 19,100,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of gross proceeds |  |  |  | 3.00% |  |  |  |  |  |  |  |  |
At Market Issuance Sales Agreements, Maximum Gross Proceeds |  | $ 20,000,000 |  | $ 20,000,000 |  |  |  |  |  |  |  |  |
Common Stock | Lincoln Park Capital, LLC Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |
Issuance of common stock, shares |  |  | 31,561 |  |  |  |  |  |  |  |  |  |
Common Stock | Underwritten Public Offering |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, shares | 17,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (usd per share) | $ 1.10 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance or Sale of Equity, Net Underwriting Discounts, Commissions and Offering Expenses | $ 15,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock purchase price per share (usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 1.00 |
New warrants issued during period (in shares) | 17,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right, Issued, Fair Value | $ 10,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Lincoln Park Capital, LLC Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount in stock repurchase program |  |  |  |  |  |  | 55,000,000 |  |  |  |  |  |
Maximum | Lincoln Park Capital, LLC Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount in stock repurchase program |  |  |  |  |  |  | $ 15,600,000 |  |  |  |  |  |

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