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Capital Stock and Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Equity [Abstract]  
Summary of Stock Option Activity
A summary of the stock option activity for the six months ended June 30, 2020 is presented below:
 Options OutstandingOptions Exercisable
Number of
Shares		Price per Share
Range		Weighted
Average
Exercise
Price		Aggregate
Intrinsic
Value (1)		Number of
Shares		Weighted
Average
Exercise
Price		Aggregate
Intrinsic
Value (1)
(in thousands, except share, per share and weighted-average data)
Balance, January 1, 20203,160,397  
$1.18 - $7.37
$2.72  $14,460  1,835,799  $2.28  $9,198  
Granted20,000  $7.59$7.59  
Exercised(662,965) 
$1.27 - $4.43
$2.90  
Canceled(99,187) 
$1.38 - $4.75
$3.35  
Balance, June 30, 20202,418,245  
$1.18 - $7.59
$2.68  $7,767  1,309,606  $2.07  $4,953  
 
(1)The intrinsic value of an option represents the amount by which the market value of the stock exceeds the exercise price of the option of in-the-money options only. The aggregate intrinsic value is based on the closing price of our common stock on the Nasdaq Capital Market, as applicable, on the respective dates.
Summary of Restricted Stock Awards and Units
The following table summarizes the number of unvested shares underlying our restricted stock awards and RSUs and the value of our unvested restricted stock awards and RSUs:
(in thousands, except share and weighted-average share data)
Number of Unvested SharesWeighted Average Grant Date Fair ValueAggregate Grant Date Fair Value of Unvested Shares
Balance, January 1, 2020502,102  $3.32  $1,665  
Granted149,302  6.48  967  
Vested(205,267) 2.86  (587) 
Balance, June 30, 2020446,137  $4.58  $2,045  
The following is a summary of our stock unit activity under the Deferred Compensation Plan for the six months ended June 30, 2020:
(in thousands, except stock units and weighted-average share data)
Number of Stock UnitsWeighted Average Grant Date Fair Value per ShareIntrinsic Value Outstanding
Balance, January 1, 2020629,003  $2.09  $4,585  
  Granted39,863  6.87  233  
  Issued(47,377) 1.65  —  
Balance, June 30, 2020621,489  $2.33  $3,629  
Details of Equity Transactions The following table details our equity transactions during the six months ended June 30, 2020:
 Preferred StockCommon StockTreasury StockAdditional
Paid-in
Capital		Accumulated DeficitTotal
 Shares$Shares$Shares$$$$
(in thousands, except share data)
Balance, January 1, 2020, as previously reported—  $—  30,149,105  $32  1,639,791  $(4,337) $88,022  $(16,248) $67,469  
Exercise of stock options—  —  316,504  —  —  —  1,198  —  1,198  
Share-based compensation—  —  55,668  —  —  —  501  —  502  
Net income—  —  —  —  —  —  —  (1,116) (1,116) 
Forfeitures of restricted stock—  —  (34,700) —  —  —  (275) —  (276) 
Balance, March 31, 2020—  $—  30,486,577  $32  1,639,791  $(4,337) $89,446  $(17,364) $67,777  
Exercise of stock options—  —  346,461  —  —  —  726  —  726  
Share-based compensation—  —  11,600  —  —  —  465  —  465  
Deferred compensation issuance—  —  47,377  —  —  —  78  —  78  
Net income—  —  —  —  —  —  —  1,369  1,369  
Forfeitures of restricted stock—  —  (61,530) —  —  —  (410) —  (410) 
Purchase of treasury stock—  —  (32,950) —  32,950  (204) —  —  (204) 
Balance, June 30 2020—  $—  30,797,535  $32  1,672,741  $(4,541) $90,305  $(15,995) $69,801  
The following table details our equity transactions during the six months ended June 30, 2019:
 Preferred StockCommon StockTreasury StockAdditional
Paid-in
Capital		Accumulated DeficitTotal
 Shares$Shares$Shares$$$$
(in thousands, except share data)
Balance, January 1, 2019, as previously reported1,321,514  $1  27,956,401  $30  1,253,105  $(2,117) $85,745  $(21,305) $62,354  
Exercise of stock options—  —  189,312  —  —  —  185  —  185  
Share-based compensation—  —  —  —  —  —  343  —  343  
Stock dividends to Carilion Clinic—  —  —  —  —  —  83  (83) —  
Net income—  —  —  —  —  —  —  1,126  1,126  
Balance, March 31, 20191,321,514  $1  28,145,713  $30  1,253,105  $(2,117) $86,356  $(20,262) $64,008  
Exercise of stock options—  —  207,786  —  —  —  182  —  182  
Share-based compensation—  —  —  —  —  —  378  —  378  
Stock dividends to Carilion Clinic—  —  —  —  —  —  90  (90) —  
Net income—  —  —  —  —  —  —  841  841  
Purchase of treasury stock—  —  (52,733) —  52,733  (220) —  —  (220) 
Balance, June 30 20191,321,514  $1  28,300,766  $30  1,305,838  $(2,337) $87,006  $(19,511) $65,189