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Stockholders' Equity (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 18, 2017 | Jul. 07, 2016 shares | Jun. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2016 shares | Jun. 30, 2016 USD ($) $ / shares shares | Mar. 31, 2016 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) item $ / shares shares | Sep. 30, 2016 USD ($) shares | Aug. 31, 2017 USD ($) | Feb. 28, 2017 USD ($) | Dec. 31, 2016 $ / shares shares | Feb. 28, 2013 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of common stock, preferred stock, depositiry shares, warrants, units or debt securities available in future public offerings | $ |  |  |  |  |  |  |  |  |  | $ 150,000 |  |  |
Common stock, preferred stock, depositiry shares, warrants, units or debt securities available in future public offerings, period from effective date | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  | 1,200,000 |  |  |  | 3,000,000 |  |  |  |  |  |  |
Proceeds from issuance of common stock from equity plans | $ |  |  |  |  |  |  |  | $ 8,818 | $ 7,529 |  |  |  |
Holders may elect to receive net proceeds from financing activities, percentage |  |  |  |  |  |  |  | 25.00% |  |  |  |  |
Common Stock, par value | $ / shares |  |  |  |  |  |  |  | $ 0.001 |  |  |  | $ 0.001 |
Number of shares of common stock called by issuance of warrants |  |  |  |  |  | 3,818,000 |  |  |  |  |  | 4,200,000 | 5,500,000
Aggregate exercise price of common stock called by issuance of warrants | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.63
Warrants outstanding |  |  |  | 0 | 0 |  |  |  | 0 |  |  | 0 |
Number of equity compensation plans | item |  |  |  |  |  |  |  | 3 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Additional shares authorized, underwriting agreement |  |  | 2,312,903 |  |  |  | 2,312,903 |  |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  |  |  | 1,289,663 | 1,259,239 |  |  |  |
Common stock reserved for issuance |  |  |  |  |  |  |  | 1,301,937 |  |  |  |  |
At the Market Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  | 0 | 3,400,000 | 3,100,000 | 3,200,000 |  | 6,500,000 |  |  |  |
Average common stock price per share | $ / shares |  |  |  |  | $ 9.56 | $ 8.80 | $ 3.86 |  |  |  |  |  |
Proceeds from issuance of common stock from equity plans | $ |  |  |  |  | $ 31,700 | $ 26,500 | $ 11,900 |  | $ 58,200 |  |  |  |
Common stock offering price shares | $ |  |  |  |  |  |  |  |  |  |  | $ 60,000 |  |
Commissions |  |  |  |  |  |  |  | 3.00% |  |  |  |  |
Underwritten Public Equity Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  | 17,732,257 |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock from equity plans | $ |  |  | $ 52,500 |  |  |  |  |  |  |  |  |  |
Commissions |  |  | 4.00% |  |  |  |  |  |  |  |  |  |
Shares authorized, underwriting agreement |  |  | 15,419,354 |  |  |  | 15,419,354 |  |  |  |  |  |
Option to purchase additional shares, period |  |  | 30 days |  |  |  |  |  |  |  |  |  |
Common Stock, par value | $ / shares |  |  | $ 0.001 |  |  |  | $ 0.001 |  |  |  |  |  |
Price per share | $ / shares |  |  | $ 3.10 |  |  |  | $ 3.10 |  |  |  |  |  |

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