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Stock-Based Compensation Expense | 6 Months Ended
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Jun. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock-Based Compensation Expense | 10. Stock-Based Compensation Expense Total stock-based compensation expense recognized in the accompanying condensed consolidated statements of operations for the three and six months ended June 30, 2019 and 2018 was as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Stock-based compensation |  | $ | 2,568 |  |  | $ | 2,209 |  |  | $ | 3,672 |  |  | $ | 4,152 |
During the three months ended June 30, 2019, the Company issued 533,361 restricted units to the Company’s board of directors which vest immediately. The grant date fair value of the restricted stock units was $0.7 million with a weighted average grant date fair value per share of $1.32. These restricted stock units will not be delivered to the Company’s board of directors until separation of services. During the three months ended June 30, 2019, the Company granted certain employees stock options to purchase an aggregate of 4,985,363 shares of common stock at a weighted average exercise price of $1.32 per share. The options vest over a four year period. The total grant date fair value of these awards is $6.6 million as determined using a Black-Scholes option pricing model. During the six months ended June 30, 2019, the Company granted certain employees stock options to purchase an aggregate of 5,333,303 shares of common stock at a weighted average exercise price of $1.33 per share. The options vest over a four year period. The grant date fair value of these awards is $6.1 million with a weighted average grant date fair value of $1.15 per share, as determined using a Black-Scholes option pricing model. In the Condensed Statements of Stockholders’ Deficit and the Condensed Consolidated Statements of Cash Flows, the prior quarter’s stock-based compensation expense is inclusive of expenses associated with restricted stock unit awards in order to conform to the current quarter presentation. As of June 30, 2019, there were $2.2 million and $12.5 million of unrecognized compensation expense related to restricted stock units and options, respectively, which vest over the vesting period except for certain options that are subject to performance conditions. The Company evaluates performance conditions as the probability that the performance conditions will be met and uses that information to estimate the date at which those performance conditions will be met in order to properly recognize stock-based compensation expense over the requisite service period.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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