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Stockholders’ Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2018 | Apr. 24, 2001 | Mar. 31, 2018 | Mar. 31, 2017 | Apr. 24, 2018 | Dec. 31, 2017 | Dec. 31, 2000
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 190,000,000 |  |  | 190,000,000 |
Common stock, shares issued (in shares) |  |  | 3,056,000 |  |  | 2,979,000 |
Common stock, shares outstanding (in shares) |  |  | 3,056,000 |  |  | 2,979,000 |
Common stock valuation (in dollars per share) |  |  | $ 10 |  |  |  |
Intrinsic value of options exercised |  |  | $ 678 | $ 34 |  |  |
Proceeds from the exercise of options |  |  | 61 | $ 61 |  |  |
Compensation cost related to nonvested awards not yet recognized |  |  | $ 2,829 |  |  |  |
2000 Plan |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares of common stock reserved for issuance |  |  |  |  |  |  | 17,200,000
2001 Plan |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares of common stock reserved for issuance |  |  | 9,000,000 |  |  | 9,000,000 |
Options granted, term |  | 10 years |  |  |  |  |
Vested options, exercise period |  | 3 months |  |  |  |  |
2001 Plan | Minimum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |
2001 Plan | Maximum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Vesting period |  | 5 years |  |  |  |  |
Stock options to purchase common stock | 2001 Plan |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of shares available for issuance (in shares) |  |  | 1,300,000 |  |  | 1,700,000 |
Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares of common stock issued upon conversion (in shares) | 24,600,000 |  |  |  |  |  |
Subsequent Event | 2001 Plan |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of shares available for issuance (in shares) |  |  |  |  | 0 |  |

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