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Share-Based Payments (Tables)
9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Costs Stock-based compensation costs included in the condensed consolidated statements of operations are presented below:
Three Months Ended 
 September 30,
Nine Months Ended 
 September 30,
2021202020212020
Cost of products$$$23 $
Cost of services35 35 134 99 
Research and development555 435 2,180 1,383 
Selling, general and administrative1,892 4,157 9,125 13,760 
Discontinued operations— (28)— (1,380)
Total$2,490 $4,600 $11,462 $13,869 
Schedule of Stock Option Activity
Stock option activity was as follows:
Number of SharesWeighted Average Exercise PriceWeighted Average Remaining Contractual Term (Years)
Balances at December 31, 202011,255,896 $15.53 7.25
Granted1,802,820 8.02 
Exercised(126,508)(4.77)
Forfeited(255,467)(6.83)
Expired(427,632)(25.93)
Balances at September 30, 202112,249,109 14.35 6.89
Exercisable at September 30, 20217,227,624 16.87 5.68
Schedule of Restricted Stock Unit Activity
RSU activity was as follows:
Number of Restricted Stock UnitsWeighted Average Grant Date Fair ValueWeighted Average Remaining Contractual Term (Years)
Balances at December 31, 20201,727,712 $6.11 0.42
Granted462,019 7.87 
Vested(1,624,013)(5.76)
Forfeited(97,237)(8.96)
Balances at September 30, 2021468,481 8.47 0.58