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Common Stock, Preferred Stock and Warrants - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |
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Oct. 31, 2016 shares | Mar. 31, 2016 USD ($) shares | Jan. 31, 2016 USD ($) ExecutiveOfficers Director shares | Apr. 30, 2015 USD ($) shares | Jan. 31, 2015 USD ($) ExecutiveOfficers Director shares | Jun. 30, 2014 USD ($) $ / shares shares | Jan. 31, 2014 USD ($) ExecutiveOfficers Director shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) | Jun. 30, 2015 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | shares |  |  |  |  |  |  |  | 100,000,000 | 100,000,000 |  |
Preferred shares, shares authorized | shares |  |  |  |  |  |  |  | 5,000,000 | 5,000,000 |  |
Total number of shares authorized | shares |  |  |  |  |  |  |  | 105,000,000 |  |  |
Common stock, par value | $ / shares |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  |
Preferred shares, par value | $ / shares |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  |
Common stock, shares issued | shares |  |  |  |  |  |  |  | 19,376,773 | 21,153,878 |  |
Common stock, shares outstanding | shares |  |  |  |  |  |  |  | 19,376,773 | 21,153,878 |  |
Number of executive officers | ExecutiveOfficers |  |  |  |  | 2 |  | 2 |  |  |  |
Number of non-employee directors | Director |  |  |  |  | 5 |  | 5 |  |  |  |
Repurchase of common stock, shares | shares |  |  |  |  |  | 3,112,840 |  |  |  |  |
Repurchase of common stock, average price per share | $ / shares |  |  |  |  |  | $ 7.71 |  |  |  |  |
Repurchase of common stock, value |  |  |  |  |  | $ 24,000,000 |  |  |  | $ 24,000,000 |
Repurchase of convertible senior notes |  |  |  |  |  |  |  | $ 8,035,000 |  | $ 39,000,000 |
Cash dividend paid |  |  |  |  |  |  |  | 0 | $ 0 |  |
4.875% Convertible Senior Notes (due 2020) |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of convertible notes repurchased and retired |  |  | $ 2,000,000 |  |  |  |  |  |  |  |
4.25% Convertible Senior Notes (due 2018) |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of convertible notes repurchased and retired |  |  |  |  |  |  |  | $ 6,100,000 |  |  |
Securities |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Retirement of common stock (share) | shares |  |  |  |  |  |  |  | 1,766,284 | 1,547,361 |  |
Retirement of common stock |  |  |  |  |  |  |  | $ 13,500,000 | $ 13,200,000 |  |
Securities | 4.875% Convertible Senior Notes (due 2020) |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of convertible notes repurchased and retired |  |  |  |  |  |  |  | 2,000,000 |  |  |
Repurchase of convertible senior notes |  |  |  |  |  |  |  | 1,900,000 |  |  |
Securities | 4.25% Convertible Senior Notes (due 2018) |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of convertible notes repurchased and retired |  |  |  |  |  |  |  | 6,100,000 |  |  |
Repurchase of convertible senior notes |  |  |  |  |  |  |  | $ 6,100,000 |  |  |
Minimum | Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 1 year |  |  |
Maximum | Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 2 years |  |  |
Maximum | Securities |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase, authorized amount |  |  |  |  |  |  |  |  |  |  | $ 35,000,000
Executive officer |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued, shares | shares |  | 134,058 | 449,120 | 135,234 | 525,734 |  | 531,993 |  |  |  |
Restricted stock issued, value |  | $ 900,000 | $ 3,600,000 | $ 900,000 | $ 3,600,000 |  | $ 3,600,000 |  |  |  |
Number of executive officers | ExecutiveOfficers |  |  | 2 |  |  |  |  |  |  |  |
Executive officer | Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  | 3 years | 3 years | 3 years | 3 years |  |  |  |  |  |
Executive officer | Minimum | Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 1 year |  |  |  |
Executive officer | Maximum | Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 3 years |  |  |  |
Non-employee directors |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued, shares | shares | 2,463 |  | 62,710 |  | 73,855 |  | 78,150 |  |  |  |
Restricted stock issued, value |  |  | $ 500,000 |  | $ 500,000 |  | $ 500,000 |  |  |  |
Number of non-employee directors | Director |  |  | 5 |  |  |  |  |  |  |  |
Non-employee directors | Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares of restricted stock, vesting date | 2017-01 |  | 2017-01 |  | 2016-01 |  | 2015-01 |  |  |  |

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