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Stockholders' Equity (Narrative) (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 18, 2017 | Feb. 28, 2018 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) item $ / shares shares | Jun. 30, 2018 USD ($) item $ / shares shares | Jun. 30, 2017 USD ($) shares | Jan. 31, 2018 shares | Dec. 31, 2017 $ / shares shares | Aug. 31, 2017 USD ($)
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 |
Number of equity compensation plans | item |  |  | 3 | 3 |  |  |  |
Share-based compensation expense | $ |  |  |  | $ 10,506 | $ 9,994 |  |  |
Proceeds from issuance of common stock from equity plans | $ |  |  |  | $ 2,517 | $ 6,231 |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Holders may elect to receive net proceeds from financing activities, percentage |  |  |  | 25.00% |  |  |  |
2010 Plan [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for issuance | shares |  |  |  |  |  | 5,800,000 |  |
2010 Director Plan [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for issuance | shares |  |  |  |  |  | 1,200,000 |  |
ESPP [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued | shares |  |  |  | 1,113,790 | 750,005 |  |  |
Common stock reserved for issuance | shares |  |  | 2,513,677 | 2,513,677 |  | 2,300,000 |  |
Underwriting Agreement [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares authorized, underwriting agreement | shares |  | 12,500,000 |  |  |  |  |  |
Common Stock, par value | $ / shares |  | $ 0.001 |  |  |  |  |  |
Option to purchase additional shares, period |  | 30 days |  |  |  |  |  |
Additional shares authorized, underwriting agreement | shares |  | 1,875,000 |  |  |  |  |  |
Shares issued | shares |  | 14,400,000 |  |  |  |  |  |
Price per share | $ / shares |  | $ 2.40 |  |  |  |  |  |
Commissions, percentage of gross proceeds |  | 4.00% |  |  |  |  |  |
Proceeds from issuance of common stock from equity offering, net of issuance costs | $ |  | $ 33,100 |  |  |  |  |  |
Other accrued offering expenses | $ |  | $ 300 |  |  |  |  |  |
At the Market Offering [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of common stock from equity offering, net of issuance costs | $ |  |  |  |  | $ 11,865 |  |  |
Underwritten Public Equity Offering [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of common stock from equity offering, net of issuance costs | $ |  |  |  | $ 32,862 | $ 52,709 |  |  |
Time-Based Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Grant date fair value, price per share | $ / shares |  |  | $ 2.57 | $ 2.57 |  |  |  |
Number of unvested equity-based payment instruments | shares |  |  | 355,000 | 355,000 |  |  |  |
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 | $ |  |  | $ 54 | $ 73 |  |  |  |
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] |  |  |  |  |  |  |  |
Grant date fair value, price per share | $ / shares |  |  | $ 2.58 | $ 2.58 |  |  |  |
Number of unvested equity-based payment instruments | shares |  |  | 652,000 | 652,000 |  |  |  |
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 | $ |  |  | $ 162 | $ 252 |  |  |  |

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