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Stockholders' Equity - Nonqualified Cash and Equity Incentive Plans (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Common stock options |  |  |  |
Fair value weighted-average assumptions: |  |  |  |
Expected stock price volatility (as a percent) | 82.70% | 81.30% | 83.20% | 81.20%
Risk free interest rate (as a percent) | 1.90% | 1.30% | 2.00% | 1.70%
Expected life of options | 6 years 3 months | 6 years 3 months | 6 years 3 months | 6 years 3 months
Expected annual dividend per share (in dollars per share) | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00
Number of Shares |  |  |  |
Balance at the beginning of the period (in shares) |  |  | 15,497,500 |
Options granted (in shares) |  |  | 2,889,500 |
Options exercised (in shares) |  |  | (464,400) |
Options forfeited (in shares) |  |  | (648,000) |
Balance at the end of the period (in shares) | 17,274,600 |  | 17,274,600 |
Vested and unvested expected to vest as of the end of the period (in shares) | 16,249,700 |  | 16,249,700 |
Exercisable at the end of the period (in shares) | 8,931,200 |  | 8,931,200 |
Weighted Average Exercise Price |  |  |  |
Balance at the beginning of the period (in dollars per share) |  |  | $ 7.37 |
Options granted (in dollars per share) |  |  | 5.44 |
Options exercised (in dollars per share) |  |  | 3.82 |
Options forfeited (in dollars per share) |  |  | 11.06 |
Balance at the end of the period (in dollars per share) | $ 7.00 |  | 7.00 |
Vested and unvested expected to vest as of the end of the period (in dollars per share) | 7.00 |  | 7.00 |
Exercisable at the end of the period (in dollars per share) | $ 6.69 |  | $ 6.69 |
Weighted Average Remaining Contractual Life |  |  |  |
Balance at the end of the period |  |  | 7 years 4 months 24 days |
Vested and unvested expected to vest at the end of the period |  |  | 7 years 3 months 18 days |
Exercisable at the end of the period |  |  | 6 years 2 months 12 days |
Aggregate Intrinsic Value |  |  |  |
Aggregate intrinsic value of options outstanding (in dollars) | $ 60,600 |  | $ 60,600 |
Aggregate intrinsic value of options vested and unvested expected to vest (in dollars) | 57,200 |  | 57,200 |
Aggregate intrinsic value of options exercisable (in dollars) | 34,200 |  | 34,200 |
Total unrecognized compensation cost related to non-vested stock options granted (in dollars) | $ 34,700,000 |  | $ 34,700,000 |
Period of recognition unrecognized compensation costs (in years) |  |  | 2 years 7 months 6 days |
Restricted stock units (RSUs) | Amended and Restated 2007 Equity Incentive Plan |  |  |  |
Aggregate Intrinsic Value |  |  |  |
Estimated fair value (in dollars per share) |  |  | $ 5.69 |
Period of recognition unrecognized compensation costs (in years) |  |  | 3 years |
Restricted Stock Units, Number of Shares |  |  |  |
Non-vested units as of the beginning of the period (in shares) |  |  | 744,400 |
Granted (in shares) |  |  | 2,348,700 |
Vested (in shares) |  |  | 203,106 |
Forfeited (in shares) |  |  | (63,800) |
Non-vested units as of the end of the period (in shares) | 2,826,200 |  | 2,826,200 |
Weighted Average Grant Date Fair Value |  |  |  |
Non-vested units as of the beginning of the period (in dollars per share) |  |  | $ 7.86 |
Granted (in dollars per share) |  |  | 5.69 |
Vested (in dollars per share) |  |  | 8.40 |
Forfeited (in dollars per share) |  |  | 7.19 |
Non-vested units as of the end of the period (in dollars per share) | $ 6.04 |  | $ 6.04 |
Weighted Average Remaining Years |  |  |  |
Non-vested units as of the end of the period |  |  | 2 years 10 months 24 days |
Aggregate Intrinsic Value |  |  |  |
Non-vested units as of the end of the period (in dollars) | $ 28,500,000 |  | $ 28,500,000 |
Unrecognized compensation cost related to unvested RSU's (in dollars) | $ 12,400,000 |  | $ 12,400,000 |
Clinical milestone | Restricted stock units (RSUs) | Amended and Restated 2007 Equity Incentive Plan |  |  |  |
Aggregate Intrinsic Value |  |  |  |
Vesting period |  |  | 3 years |
Restricted Stock Units, Number of Shares |  |  |  |
Granted (in shares) |  |  | 401,413 |
Executive Officers | Market Performance-based Restricted Stock Units (MPRSUs) | Amended and Restated 2007 Equity Incentive Plan |  |  |  |
Aggregate Intrinsic Value |  |  |  |
Vesting period |  |  | 3 years |
Estimated fair value (in dollars per share) |  |  | $ 8.08 |
Restricted Stock Units, Number of Shares |  |  |  |
Granted (in shares) |  |  | 401,413 |
Weighted Average Grant Date Fair Value |  |  |  |
Granted (in dollars per share) |  |  | $ 8.08 |
Executive Officers | Market Performance-based Restricted Stock Units (MPRSUs) | Amended and Restated 2007 Equity Incentive Plan | Cliff Vesting |  |  |  |
Aggregate Intrinsic Value |  |  |  |
Vesting period |  |  | 3 years |
Maximum | Executive Officers | Market Performance-based Restricted Stock Units (MPRSUs) | Amended and Restated 2007 Equity Incentive Plan |  |  |  |
Fair value weighted-average assumptions: |  |  |  |
Vesting percentage |  |  | 200.00% |
Number of Shares |  |  |  |
Exercisable at the end of the period (in shares) | 802,826 |  | 802,826 |

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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 Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + 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 (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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