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Stock-Based Compensation - Summary of Option and RSU Activity (Details) - $ / shares |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 | Aug. 23, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2014 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Shares Available for Grant |  |  |  |  |  |  |  |
Options granted (in shares) |  | (334,027) |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Options granted (in shares) |  | 334,027 |  |  |  |  |  |
Options cancelled and expired (in shares) |  | (456,995) |  |  |  |  |  |
Equity Incentive Plan 2010 |  |  |  |  |  |  |  |
Shares Available for Grant |  |  |  |  |  |  |  |
Balance at the beginning of the year (in shares) | 231,000 |  |  |  |  | 231,000 | 114,000 | 106,000
Additional shares authorized | 50,000 |  |  |  |  |  |  |
RSUs cancelled and returned to Plan (in shares) |  |  |  |  |  |  |  | 8,000
Options granted (in shares) |  |  |  |  |  | (40,000) | (160,000) | (384,000)
Options cancelled and returned to Plan (in shares) |  |  |  |  |  | 10,000 | 375,000 | 479,000
Balance at the end of the period (in shares) |  |  | 4,007,000 | 231,000 |  | 4,007,000 | 231,000 | 114,000
Number of Shares |  |  |  |  |  |  |  |
Balance at the beginning of the year (in shares) | 307,000 |  |  |  |  | 307,000 | 522,000 | 675,000
Additional shares authorized | 50,000 |  |  |  |  |  |  |
RSUs cancelled and returned to Plan (in shares) |  |  |  |  |  |  |  | (8,000)
Options granted (in shares) |  |  |  |  |  | 40,000 | 160,000 | 384,000
Options cancelled and returned to Plan (in shares) |  |  |  |  |  | 10,000 | 375,000 | 479,000
Options cancelled and expired (in shares) |  |  |  |  |  |  |  | (58,000)
Balance at the end of the period (in shares) |  |  | 337,000 | 307,000 |  | 337,000 | 307,000 | 522,000
Weighted Average Exercise Prices |  |  |  |  |  |  |  |
Weighted-average exercise price (in dollars per share) | $ 4.81 |  |  |  |  | $ 4.81 | $ 13.88 | $ 35.10
Options granted (in dollars per share) |  |  |  |  |  | 1.28 | 0.76 | 6.96
Options cancelled and returned to Plan (in dollars per share) |  |  |  |  |  | 11.63 | 15.69 | 35.64
Options cancelled and expired (in dollars per share) |  |  |  |  |  |  |  | 44.80
Weighted-average exercise price (in dollars per share) |  |  | $ 4.19 | $ 4.81 |  | $ 4.19 | $ 4.81 | $ 13.88
Options | Equity Incentive Plan 2010 |  |  |  |  |  |  |  |
Shares Available for Grant |  |  |  |  |  |  |  |
Additional shares authorized |  |  | 4,000,000 | 200,000 | 150,000 | 4,050,000 | 250,000 | 50,000
Number of Shares |  |  |  |  |  |  |  |
Additional shares authorized |  |  | 4,000,000 | 200,000 | 150,000 | 4,050,000 | 250,000 | 50,000
RSU's | Equity Incentive Plan 2010 |  |  |  |  |  |  |  |
Shares Available for Grant |  |  |  |  |  |  |  |
RSUs granted (in shares) |  |  |  |  |  | (268,000) | (407,000) | (144,000)
RSUs cancelled and returned to Plan (in shares) |  |  |  |  |  | 24,000 | 59,000 | 7,000
Number of Shares |  |  |  |  |  |  |  |
RSUs cancelled and returned to Plan (in shares) |  |  |  |  |  | (24,000) | (59,000) | (7,000)
Weighted Average Exercise Prices |  |  |  |  |  |  |  |
RSUs granted (in dollars per share) |  |  |  |  |  | $ 0.89 | $ 0.93 | $ 5.30
RSUs cancelled and returned to Plan (in dollars per shares) |  |  |  |  |  | $ 1.21 | $ 5.04 | $ 15.67

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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