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Share Based Compensation
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Share-Based Compensation Share-Based Compensation
Equity Plans
The Company grants awards to recipients through the 2017 Equity Incentive Plan, as amended (the 2017 Plan), which was approved by stockholders and the Board of Directors. The 2017 Plan provided for the issuance of shares that total no more than the sum of (i) 14,500,000 new shares, (ii) approximately 384,000 unallocated shares remaining available for the grant of new awards under the Second Amended and Restated 2007 Equity Incentive Plan, (iii) any returning shares such as forfeited, cancelled, or expired shares and (iv) 500,000 shares pursuant to an inducement award. The number of shares available to be issued under the 2017 Plan will be reduced by (i) one share for each share that relates to an option or stock appreciation right award and (ii) 1.5 shares for each share which relates to an award other than a stock option or stock appreciation right award (a full-value award). As of September 30, 2021, there were approximately 5.0 million remaining shares available for issuance under this plan. Options expire 10 years from the date of grant.
General Vesting Conditions
The Company’s stock options and restricted stock unit awards are generally subject to a one-year cliff vesting period after which 1/3 of the shares vest with the remaining shares vesting ratably over a two-year period subject to the passage of time. Additionally, certain stock option awards are market or performance based and vest based on certain triggering events established by the Compensation Committee.
Stock Options
The fair value of the Company’s stock options that are not market based are estimated at the grant date using the Black-Scholes option pricing model. The Company used the following weighted average assumptions for options granted during the nine months ended September 30, 2021:
Weighted Average: Nine Months Ended September 30, 2021
Expected term5.8 years
Expected volatility74.4 %
Risk-free rate1.0 %
Expected dividends— %

Service Period Based Stock Options
The following table summarizes activity of service period-based stock options during the nine months ended September 30, 2021:
Weighted Average
(In thousands except per-share data and remaining contractual term)Number of
Options		Exercise
Price		Remaining
Contractual
Term (Years)		Aggregate
Intrinsic
Value
Outstanding at December 31, 202010,833 $3.96 6.8
Options Granted1,527 9.08 
Options Exercised(2,114)4.35 $13,236 
Options Forfeited(747)4.49 
Outstanding at September 30, 20219,499 $4.66 6.7$19,690 *
Exercisable at September 30, 20216,372 $3.71 5.5$16,367 *
*The aggregate intrinsic values in the table above are based on the Company’s stock price of $6.27, which is the closing price of the Company’s stock on the last day of business for the period ended September 30, 2021.
Performance Based Stock Options
The Company also grants stock option awards that are performance based and vest based on the achievement of certain criteria established from time to time by the Compensation Committee. If these performance criteria are not met, the compensation expenses are not recognized and the expenses that have been recognized will be reversed.
The following table summarizes performance based stock options activity during the nine months ended September 30, 2021:
 Weighted Average
(In thousands except per share data and remaining contractual term)Number of
Options		Exercise
Price		Remaining
Contractual
Term (Years)		Aggregate
Intrinsic
Value
Outstanding at December 31, 202081 $4.34 3.1
Options Granted— — 
Options Exercised(40)4.34 $401 
Options Forfeited— — 
Outstanding at September 30, 202141 $4.34 2.3$79 *
Exercisable at September 30, 202141 $4.34 2.3$79 *
*The aggregate intrinsic values in the table above are based on the Company’s stock price of $6.27, which is the closing price of the Company’s stock on the last day of business for the period ended September 30, 2021.

Restricted Stock Units
The following table summarizes activity of restricted stock units during the nine months ended September 30, 2021:
(In thousands except per share fair value)Number of RSUsWeighted Average
Fair Value
Unvested shares at December 31, 2020— $— 
Granted123 10.94 
Vested— — 
Forfeited(7)11.83 
Unvested shares at September 30, 2021116 $10.90 
Expected to vest at September 30, 2021116 $10.90 
Total Share-Based Compensation
Total share-based compensation expense was as follows:
Three Months Ended September 30,Nine Months Ended September 30,
(In thousands)2021202020212020
Share-based compensation expense
Cost of sales$58 $42 $156 $117 
Sales and marketing456 336 1,298 810 
Research and development275 133 633 405 
General and administrative1,033 1,063 2,635 3,826 
Total$1,822 $1,574 $4,722 $5,158 
In future periods, the Company expects to recognize approximately $10.7 million and $1.1 million in share-based compensation expense for unvested options and unvested restricted stock units, respectively, that were outstanding as of September 30, 2021. Future share-based compensation expense will be recognized over 2.1 and 2.6 weighted average years for unvested options and restricted stock units, respectively.