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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Accounting Policies [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The fair value of stock options granted during the year ended December 31, 2016 was estimated using the Black-Scholes option-pricing model, based on the following weighted-average assumptions:
| Weighted-Average Assumptions
Risk-free interest rate | 1.1%
Term | 3.06
Volatility | 53%
Dividend yield | —%
Property and Equipment, Useful Lives | Depreciation and amortization is computed on a straight-line basis over the following estimated useful lives of the assets:
Furniture and fixtures | 3 to 5 years
Computer hardware and software | 3 to 5 years
Leasehold improvements | 2 to 5 years (Lesser of lease term or useful life of improvement)
Schedule of Earnings Per Share, Basic and Diluted | The following table presents the weighted-average number of common shares outstanding used in the calculation of basic and diluted income per share:
|  | 2016 |  | 2015 |  | 2014
Numerator (in thousands): |  |  |  |  |  |
Basic and Diluted |  |  |  |  |  |
Net loss |  | $ | (54,067 | ) |  | $ | (160,036 | ) |  | $ | (66,029 | )
Total dividends declared / paid |  | — |  |  | (25,434 | ) |  | (25,039 | )
Dividends attributable to common stockholders |  | — |  |  | 24,740 |  |  | 24,313 |
Net loss attributable to common stockholders – basic and diluted |  | $ | (54,067 | ) |  | $ | (160,730 | ) |  | $ | (66,755 | )
Denominator: |  |  |  |  |  |
Weighted-average shares used in computing net loss per share attributable to common stockholders – basic and diluted |  | 50,075,847 |  |  | 49,505,817 |  |  | 48,658,088 |
Basic and diluted net loss per common share |  | $ | (1.08 | ) |  | $ | (3.25 | ) |  | $ | (1.37 | )
Anti-dilutive equity-based incentive awards excluded from the computation of diluted loss per share |  | 3,682,532 |  |  | 71,468 |  |  | 27,760 |

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- Definition Tabular disclosure of the effect of income (loss) on an entity's diluted earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1311-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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