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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Options Activity | The following is a summary of stock options activity during the six months ended June 30, 2019:
|  | Options Outstanding |
|  | Number of Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (years) |  |  | Aggregate Intrinsic Value |
Balance—January 1, 2019 |  |  | 1,867,747 |  |  | $ | 9.01 |  |  | 9.64 |  |  | $ | 19,573,295 |
Options granted |  |  | 131,905 |  |  | $ | 10.00 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (44 | ) |  | $ | 4.14 |  |  |  |  |  |  | $ | — |
Options cancelled |  |  | (104,746 | ) |  | $ | 8.23 |  |  |  |  |  |  |  |  |
Balance—June 30, 2019 |  |  | 1,894,862 |  |  | $ | 9.14 |  |  |  | 9.24 |  |  | $ | 596,194 |
Exercisable as of June 30, 2019 |  |  | 201,770 |  |  | $ | 6.21 |  |  |  | 7.56 |  |  | $ | 397,416 |
Vested and expected to vest as of June 30, 2019 |  |  | 1,894,862 |  |  | $ | 9.14 |  |  |  | 9.24 |  |  | $ | 596,194 |
Summary of Weighted Average Assumptions Used in Black-Scholes Option-Pricing Model to Determine Grant Fair Value | The following are weighted average assumptions used in the Black-Scholes option-pricing model to determine grant fair value:
|  | June 30, 2018 |  |  | June 30, 2019 |
|  | Weighted- Average |  |  | Weighted- Average |
Expected term (in years) |  |  | 0.00 |  |  |  | 5.73 |
Volatility |  |  | 0.00 | % |  |  | 66.04 | %
Risk-free interest rate |  |  | 0.00 | % |  |  | 1.92 | %
Dividend Yield |  |  | 0.000 |  |  |  | 5.94 |
Summary of Restricted Stock Activity | A summary of restricted stock activity within the Company’s equity plans and changes for the six months ended June 30, 2019, is as follows:
Restricted Stock Awards |  | Shares |  |  | Weighted Average Grant- Date Fair Value |
Nonvested at January 1, 2019 |  |  | — |  |  | $ | — |
Granted |  |  | 2,560,148 |  |  | $ | 19.26 |
Vested |  |  | — |  |  | $ | — |
Forfeited |  |  | (69,141 | ) |  | $ | 19.50 |
Nonvested at June 30, 2019 |  |  | 2,491,007 |  |  | $ | 19.25 |
Summary of Total Stock-based Compensation Expense by Function | The following table summarizes the total stock-based compensation expense by function for the three and six months ended June 30, 2018 and 2019:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2019 |  |  | 2018 |  |  | 2019 |
|  | (in thousands) |  |  | (in thousands) |
Cost of goods sold |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Sales and distribution expenses |  |  | 2 |  |  |  | 528 |  |  |  | 6 |  |  |  | 916 |
Research and development expenses |  |  | 7 |  |  |  | 390 |  |  |  | 13 |  |  |  | 550 |
General and administrative expenses |  |  | 168 |  |  |  | 1,701 |  |  |  | 322 |  |  |  | 2,653 |
Total stock-based compensation expense |  | $ | 177 |  |  | $ | 2,619 |  |  | $ | 341 |  |  | $ | 4,119 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock 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=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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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=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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