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Summary of Significant Accounting Policies Equity Incentive Awards (Tables) | 3 Months Ended
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Mar. 31, 2020
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Expected Volatility |  | Risk-free Interest Rate |  | Expected Term |  | Dividend Rate
March 31, 2020: |  |  |  |  |  |  |  |
Employees |  | 89 | % |  | 1.3 | % |  | 4 |  | — | %
Officers and non-employee directors |  | 77 | % |  | 1.4 | % |  | 8 |  | — | %
March 31, 2019: |  |  |  |  |  |  |  |
Employees |  | 63 | % |  | 2.5 | % |  | 4 |  | — | %
Officers and non-employee directors |  | 63 | % |  | 2.6 | % |  | 8 |  | — | %
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Options |  | Weighted Average Exercise Price
|  | (in thousands) |  |
Outstanding at December 31, 2019 |  | 7,695 |  |  | $ | 8.95 |
Granted |  | 3,301 |  |  | 3.31 |
Expired |  | (202) |  |  | 13.30 |
Forfeited |  | (73) |  |  | 11.10 |
Outstanding at March 31, 2020 |  | 10,721 |  |  | 7.11 |
Exercisable at March 31, 2020 |  | 4,731 |  |  | $ | 9.83 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Shares |  | Weighted Average Grant Date Fair Value
|  | (in thousands) |  |
Outstanding at December 31, 2019 |  | 2,830 |  |  | $ | 6.35 |
Granted |  | 3,060 |  |  | 3.31 |
Vested |  | (1,032) |  |  | 7.02 |
Forfeited |  | (34) |  |  | 5.28 |
Outstanding at March 31, 2020 |  | 4,824 |  |  | $ | 4.29 |

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- Definition Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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