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Stock-Based Compensation Expense (Tables) | 6 Months Ended
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Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock Based Compensation Expense Recognized in Accompanying Condensed Consolidated Statements of Operations | Total stock-based compensation expense recognized in the accompanying condensed consolidated statements of operations for the three and six months ended June 30, 2020 and 2019 was as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
RSUs and options |  | $ | 2,122 |  |  | $ | 2,527 |  |  | $ | 3,188 |  |  | $ | 3,397 |
Employee stock purchase plan |  |  | 63 |  |  |  | 41 |  |  |  | 125 |  |  |  | 275 |
Total stock compensation expense |  | $ | 2,185 |  |  | $ | 2,568 |  |  | $ | 3,313 |  |  | $ | 3,672 |
Schedule of Employee Awards and Non-employee Director Award Plan Activity | During 2020, the Company granted the following awards:
|  | Three Months Ended |  |  | Three Months Ended |  |  | Six Months Ended |
|  | March 31, 2020 |  |  | June 30, 2020 |  |  | June 30, 2020 |
Employee awards: |  |  |  |  |  |  |  |  |  |  |  |
RSUs |  |  | 230,000 |  | (1) |  | 2,109,228 |  | (2) |  | 2,339,228 |
Options |  |  | 78,500 |  | (3) |  | 117,900 |  | (4) |  | 196,400 |
Non-employee director awards: |  |  |  |  |  |  |  |  |  |  |  |
RSUs |  |  | 42,067 |  | (5) |  | 772,685 |  | (6) |  | 814,752 |
Total awards: |  |  |  |  |  |  |  |  |  |  |  |
RSUs |  |  | 272,067 |  |  |  | 2,881,913 |  |  |  | 3,153,980 |
Options |  |  | 78,500 |  |  |  | 117,900 |  |  |  | 196,400 |
(1) | RSUs had a weighted average grant date fair value of $1.25 per share and a primary vesting period of four years.
(2) | RSUs had a weighted average grant date fair value of $1.34 per share and a primary vesting period of four years.
(3) | Options had a weighted average exercise price of $1.25 per share and vest over a four year period. The weighted average grant date fair value was $0.93 per share, as determined using a Black-Scholes option pricing model, with the following key assumptions: risk-free interest rate of 0.79%; expected life of approximately 5.67 years; volatility of 93.83%, and dividend yield of zero.
(4) | Options had a weighted average exercise price of $1.34 per share and vest over a four year period. The weighted average grant date fair value was $0.99 per share, as determined using a Black-Scholes option pricing model, with the following key assumptions: risk-free interest rate of 0.39%; expected life of approximately 5.67 years; volatility of 93.83%, and dividend yield of zero.
(5) | RSUs had a weighted average grant date fair value of $1.17 per share and vested immediately upon grant, but the underlying shares of common stock will not be delivered until there is a separation of service, such as resignation, retirement or death.
(6) | RSUs had a weighted average grant date fair value of $1.34 per share and vested immediately upon grant, but the underlying shares of common stock will not be delivered until there is a separation of service, such as resignation, retirement or death.

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