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Stock-Based Compensation - Summary of Option and RSU Activity (Details) - $ / shares |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 23, 2016 | Jan. 01, 2016 | Jun. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Shares Available for Grant |  |  |  |  |  |  |
Options granted (in shares) | (334,027) |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |
Options cancelled and expired (in shares) | (456,995) |  |  |  |  |  |
Weighted Average Exercise Prices |  |  |  |  |  |  |
Weighted-average exercise price (in dollars per share) | $ 7.20 |  |  |  |  |  |
Equity Incentive Plan2010 [Member] |  |  |  |  |  |  |
Shares Available for Grant |  |  |  |  |  |  |
Additional shares authorized |  | 50,000 |  |  |  |  |
Inducement Stock Options |  |  |  |  |  |  |
Shares Available for Grant |  |  |  |  |  |  |
Options expired (in shares) |  |  |  |  | (7,000) | (129,000) |
Number of Shares |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  | 164,000 |  | 164,000 | 223,000 | 318,000 |
Options granted (in shares) |  |  |  |  |  | 41,000 |
Options cancelled (in shares) |  |  |  | (164,000) |  |  |
Options exercised (in shares) |  |  |  |  | (52,000) | (7,000) |
Options expired (in shares) |  |  |  |  | (7,000) | (129,000) |
Balance at the end of the period (in shares) |  |  |  |  | 164,000 | 223,000 |
Weighted Average Exercise Prices |  |  |  |  |  |  |
Weighted-average exercise price (in dollars per share) |  |  |  |  | $ 43.74 | $ 36.78 | $ 44.23
Options granted (in dollars per share) |  |  |  |  |  | 36.80 |
Options exercised (in dollars per share) |  |  |  |  | 15.48 | 25.87 |
Options expired (in dollars per share) |  |  |  |  | $ 31.79 | $ 55.75 |
Options cancelled (in dollars per share) |  |  |  | $ 43.74 |  |  |
Options | Mosy Plans [Member] |  |  |  |  |  |  |
Shares Available for Grant |  |  |  |  |  |  |
Balance at the beginning of the year (in shares) |  | 106,000 |  | 106,000 | 176,000 | 42,000 |
Restricted stock units granted (in shares) |  |  |  | (144,000) |  | (50,000) |
Restricted stock units cancelled (in shares) |  |  |  | 7,000 | 2,000 |  |
Options granted (in shares) |  |  |  | (384,000) | (154,000) | (17,000) |
Options cancelled (in shares) |  |  |  | 479,000 | 70,000 | 49,000 |
Options expired (in shares) |  |  |  |  | (38,000) | (48,000) |
Balance at the end of the year (in shares) |  |  |  | 114,000 | 106,000 | 176,000 |
Number of Shares |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  | 675,000 |  | 675,000 | 599,000 | 672,000 |
Options granted (in shares) |  |  |  | 384,000 | 154,000 | 17,000 |
Options cancelled (in shares) |  |  |  | (479,000) | (70,000) | (49,000) |
Options cancelled and expired (in shares) |  |  |  | (58,000) |  |  |
Options exercised (in shares) |  |  |  |  | (8,000) | (41,000) |
Options expired (in shares) |  |  |  |  | (38,000) | (48,000) |
Balance at the end of the period (in shares) |  |  |  | 522,000 | 675,000 | 599,000 |
Weighted Average Exercise Prices |  |  |  |  |  |  |
Weighted-average exercise price (in dollars per share) |  |  |  | $ 13.88 | $ 35.14 | $ 38.73 | $ 38.64
Options granted (in dollars per share) |  |  |  | (6.96) | 20.22 | 35.34 |
Options exercised (in dollars per share) |  |  |  |  | 16.37 | 30.64 |
Options expired (in dollars per share) |  |  |  | 44.80 | 32.00 | 43.20 |
Options cancelled (in dollars per share) |  |  |  | $ 35.64 | $ 35.23 | $ 43.08 |
Options | Equity Incentive Plan2010 [Member] |  |  |  |  |  |  |
Shares Available for Grant |  |  |  |  |  |  |
Additional shares authorized |  |  | 150,000 | 50,000 | 50,000 | 200,000 |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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