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Share-Based Payments (Tables)
6 Months Ended
Jun. 30, 2020
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 
 June 30,
Six Months Ended 
 June 30,
2020201920202019
Cost of products$ $ $ $12  
Cost of services35  52  64  117  
Research and development364  1,360  953  2,701  
Selling, general and administrative4,496  (1,900) 9,592  4,934  
Discontinued operations—  545  (1,346) 1,351  
Total$4,897  $61  $9,269  $9,115  
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, 20199,022,282  $21.94  6.10
Granted5,287,092  10.43  
Exercised(20,780) (3.17) 
Forfeited(834,286) (16.27) 
Expired(2,071,269) (27.30) 
Balances at June 30, 202011,383,039  16.07  7.55
Exercisable at June 30, 20205,604,412  20.02  5.86
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, 20191,781,982  $8.71  1.24
Granted3,103,819  3.08  
Vested(2,625,093) (3.97) 
Forfeited(363,527) (8.57) 
Balances at June 30, 20201,897,181  6.09  0.87