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Stockholder's Equity
 12 Months Ended
Dec. 31, 2020
Stockholders' Equity Note [Abstract]  
Stockholders' Equity Stockholder's Equity
Common Stock
During the year ended December 31, 2020 
Common Stock

    During the year ended December 31, 2020 the Company issued 71,667 shares of Common Stock as a result of employee stock option and warrant exercises, and received net cash proceeds of approximately $0.7 million.
During the year ended December 31, 2019 

    During the year ended December 31, 2019 the Company issued 299,167 shares of Common Stock as a result of employee stock option exercises presented in the tables below, and received net cash proceeds of approximately $2.7 million.

    During the year ended December 31, 2019, the Company issued 19,122 shares of its Common Stock in relation to the cashless exercise of stock options that were granted outside of the Company's 2017 Long-Term Incentive Stock Plan (the "2017 Plan"). A total of 80,000 stock options were exercised with exercise prices between $10.00 and $15.00 per share.

    During the year ended December 31, 2019, the Company issued 11,000 shares of its Common Stock as a result of the exercise of stock purchase warrants with an exercise price of $10.00 per share for total proceeds of $110,000.

    During the year ended December 31, 2019 the Company issued 11,788 shares of its Common stock with an aggregate value of $160.9 thousand for services provided to the Company.
Stock Options 
    On September 8, 2017, the Company held its Annual Meeting of Stockholders (the “Annual Meeting”), at which time the 2017 Plan was approved by stockholder vote. The 2017 Plan allows the Company to grant both incentive stock options (“ISOs”) and non-qualified stock options (“NSOs”) to purchase a maximum of 400,000 shares of the Company's Common Stock. Under the terms of the 2017 Plan, ISOs may only be granted to Company employees and directors, while NSOs may be granted to employees, directors, advisors, and consultants. The Board has the authority to determine to whom options will be granted, the number of options, the term, and the exercise price. Options are to be granted at an exercise price not less than fair value for an ISO or an NSO. The vesting period is normally over a period of four years from the vesting date. The contractual term of an option is no longer than ten years. As of December 31, 2020, the Company had 161,342 shares available for future issuance under the 2017 Plan.
    Prior to adopting the 2017 Plan, the Company did not have a formal long-term incentive stock plan. Prior to the implementation of the 2017 Plan, the Company had discretion to provide designated employees of the Company and its affiliates, certain consultants, and advisors who perform services for the Company and its affiliates, and non-employee members of the Board and its affiliates with the opportunity to receive grants of non-qualified stock options (the "Pre-2017 Non-Qualified Stock Options"). All of the Pre-2017 Non-Qualified Stock Option Grants were intended to qualify as non-qualified stock options. There were no Pre-2017 Non-Qualified Stock Option Grants that were intended to qualify as incentive stock options.
    Stock option activity for the Pre-2017 Non-Qualified Stock Options for the years ended December 31, 2020 and 2019, is presented in the table below: 
 Number of
Shares		Weighted-
average
Exercise
Price		Weighted-
average
Remaining
Contractual
Term
(years)		Aggregate
Intrinsic
Value
Outstanding at December 31, 20182,885,500 $7.30 6.04$20,633,100 
Exercised(379,167)$9.03 
Forfeited(5,833)$10.00 
Outstanding at December 31, 20192,500,500 $7.03 5.05$18,426,325 
Exercised(20,000)$9.50 
Forfeited(15,000)$10.00 
Outstanding at December 31, 20202,465,500 $6.99 4.09$2,773,190 
Exercisable at December 31, 20202,430,502 $6.95 4.15$2,773,190 
 

During the years ended December 31, 2020 and 2019, the Company recognized approximately $1,235 and $152 thousand of non-cash expense related to vested Pre-2017 Non-Qualified Stock Options granted in prior periods. As of December 31, 2020, there is $0 of unrecognized compensation costs related to non-vested stock options. 
The 2017 Plan

    The assumptions used in the valuation of options granted under the 2017 Plan during the years ended December 31, 2020 and 2019 were as follows:
Year Ended December 31, 2020Year Ended December 31, 2019
Market value of stock on measurement date
$8.79 to $13.60
$11.26 to $15.65
Risk-free interest rate
0.33% to 1.68%
1.67% to 2.57%
Dividend yield— %— %
Volatility factor
91% to 101%
104% to 139%
Term (years)
5.5 to 6.25
5.5 to 6.25

    Stock option activity for options granted under the 2017 Plan during the years ended December 31, 2020 and 2019 is presented in the table below:
Number of
Shares Outstanding		Weighted-
average
Exercise
Price		Weighted-
average
Remaining
Contractual
Term
(years)		Aggregate
Intrinsic
Value
Outstanding at December 31, 2018343,550 $28.97 8.95$840 
Granted193,700 $13.82 
Expired— 
Forfeited(45,300)$17.9 
Outstanding at December 31, 2019491,950 $24.08 8.43$81,888 
Granted191,500 $12.12 
Expired— 
Forfeited(71,690)$15.05 
Balance at December 31, 2020611,760 $21.39 7.85$— 
Exercisable at December 31, 2020323,055 $26.01 7.25$— 
 


During the year ended December 31, 2020 and 2019, the Company recognized approximately $2.1 million and $3.0 million of non-cash expense related to vested options granted during these periods. As of December 31, 2020, there was approximately $1.3 million of unrecognized compensation costs related to non-vested stock options that were granted under the 2017 Plan.

Restricted Stock Units

    Restricted stock activity during the year ended December 31, 2020 is presented in the following table.

Number of SharesGrant Date Fair Value Per Share
Restricted stock units outstanding December 31, 201927,000 $14.51
Restricted stock granted49,600 $12.00
Restricted stock forfeited(27,000)$14.51
Restricted stock units outstanding December 31, 202049,600 $12.00

    Twenty-five percent (25%) of the restricted stock units will vest on the one year anniversary of the vesting commencement date, and twenty-five percent (25%) will vest annually thereafter on the same day as the vesting commencement date. During the year ended December 31, 2020, the Company recognized approximately $0.2 million of non-cash expense related to restricted stock units. As of December 31, 2020, there was $0.3 million of total unrecognized compensation cost related to restricted stock units.

Warrants 
    Warrant activity for the years ended December 31, 2020 and 2019 is presented in the table below:
Number of
Warrants		Weighted-
average
Exercise
Price		Weighted-
average
Remaining
Contractual
Term
(years)		Aggregate
Intrinsic
Value
Outstanding at December 31, 2018353,610 $9.78 4.6$1,651,165 
Exercised(11,000)$10.00 
Outstanding at December 31, 2019342,610 $9.77 3.71$1,585,084 
Exercised(59,510)$10.00 
Forfeited(4,300)$10.00 
Outstanding at December 31, 2020278,800 $9.72 3.51$1,164 
Exercisable at December 31, 2020278,800 $9.72 3.51$1,164