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Stockholders' Equity (Narrative) (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 18, 2017 USD ($) | Sep. 30, 2018 USD ($) $ / shares shares | Feb. 28, 2018 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) item $ / shares shares | Sep. 30, 2019 USD ($) item $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares item shares | Jan. 31, 2019 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 |  |  |  |  |  |  |
Common Stock, par value | $ / shares |  |  |  | $ 0.001 | $ 0.001 |  | $ 0.001 |
Proceeds from issuance of common stock from underwritten public equity offering, net of issuance costs | $ |  |  |  |  |  | $ 97,722 |  |
Number of equity compensation plans | item |  |  |  | 3 | 3 |  |  |
Share-based compensation expense | $ |  |  |  |  | $ 12,532 | $ 15,631 |  |
2010 Plan [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for issuance | shares |  |  |  |  |  |  |  | 7,500,000
ESPP [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued | shares |  |  |  | 0 | 1,306,329 | 1,674,960 |  |
Common stock reserved for issuance | shares |  |  |  | 3,651,066 | 3,651,066 |  |  | 3,000,000
Underwritten Public Equity Offering [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares authorized, underwriting agreement | shares |  | 14,117,647 | 12,500,000 |  |  | 14,117,647 |  |
Common Stock, par value | $ / shares |  | $ 0.001 | $ 0.001 |  |  | $ 0.001 |  |
Common stock offering price per share | $ / shares |  | $ 4.25 | $ 2.40 |  |  | $ 4.25 |  |
Option to purchase additional shares, period |  | 30 days | 30 days |  |  |  |  |
Additional shares authorized, underwriting agreement | shares |  | 2,117,647 | 1,875,000 |  |  | 2,117,647 |  |
Shares issued | shares |  | 16,200,000 | 14,400,000 |  |  |  | 30,600,000 |
Price per share | $ / shares |  | $ 4.25 | $ 2.40 |  |  | $ 4.25 | $ 3.38 |
Commissions, percentage of gross proceeds |  | 6.00% | 4.00% |  |  |  |  |
Proceeds from issuance of common stock from underwritten public equity offering, net of issuance costs | $ |  | $ 64,900 | $ 33,100 |  |  |  | $ 97,500 |
Other accrued offering expenses | $ |  | $ 200 | $ 300 |  |  | $ 200 |  |
Holders may elect to receive net proceeds from financing activities, percentage |  |  |  |  |  |  | 25.00% |
Number of offerings | item |  |  |  |  |  |  | 2 |
Time-Based Restricted Stock Units (RSUs) [Member] | 2010 Plan [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 4 years |  |  |
Share-based compensation expense | $ |  |  |  | $ 1,400 | $ 3,400 |  |  |
Time-Based Restricted Stock Units (RSUs) [Member] | 2010 Plan [Member] | Share-based Compensation Award, Tranche One, Two, Three and Four [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 25.00% |  |  |
Performance-Based Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Ratio of number of shares into which the share instrument may be converted | shares |  |  |  |  | 1 |  |  |
Performance-Based Restricted Stock Units (RSUs) [Member] | 2010 Plan [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  | $ 23 | $ 53 |  |  |

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