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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of RSU Activity | RSU activity for the three months ended March 31, 2020 is as follows (in thousands, except for weighted-average grant date fair value):
|  | Number of RSUs |  |  | Weighted-Average Grant Date Fair Value |
Outstanding as of December 31, 2019 |  |  | 943 |  |  | $ | 24.68 |
Granted |  |  | 3,167 |  |  |  | 5.40 |
Vested and delivered |  |  | (220 | ) |  |  | 24.80 |
Forfeited |  |  | (87 | ) |  |  | 22.82 |
Outstanding as of March 31, 2020 (1) |  |  | 3,803 |  |  |  | 8.66 |
| (1) | The outstanding balance as of March 31, 2020 includes 80 RSUs that were vested, but not yet delivered.
Summary of PSU Activity | PSU activity for the three months ended March 31, 2020 is as follows (in thousands, except for weighted-average grant date fair value):
|  | Number of PSUs |  |  | Weighted-Average Grant Date Fair Value |
Outstanding as of December 31, 2019 |  |  | 953 |  |  | $ | 26.60 |
Granted (1) |  |  | 715 |  |  |  | 5.40 |
Vested and delivered |  |  | — |  |  |  | — |
Forfeited or cancelled (1) |  |  | (775 | ) |  |  | 27.13 |
Outstanding as of March 31, 2020 |  |  | 893 |  |  |  | 8.78 |
| (1) | Included in "Forfeited or cancelled" are 558 shares that were cancelled and replaced by new grants during the three months ended March 31, 2020.
Summary of Stock Option Activity | Stock option activity for the three months ended March 31, 2020 is as follows (in thousands, except for weighted-average grant date fair value):
|  | Number of Options |  |  | Weighted-Average Grant Date Fair Value |
Outstanding as of December 31, 2019 |  |  | — |  |  | $ | — |
Granted |  |  | 513 |  |  |  | 2.80 |
Vested and delivered |  |  | — |  |  |  | — |
Forfeited |  |  | — |  |  |  | — |
Outstanding as of March 31, 2020 |  |  | 513 |  |  |  | 2.80 |
Summary of Fair Value of Stock Options Granted are Estimated Using Black Scholes Option Pricing Model | The fair value of the stock options granted during the three months ended March 31, 2020 are estimated on the grant date using the Black-Scholes option pricing model, using the following assumptions:
Risk-free interest rate |  | 1.01 | %
Weighted-average volatility |  | 53.08 | %
Dividend yield |  | 0 | %
Expected years until exercise | 6.5 |

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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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares. + 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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