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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of stock-based compensation expense
For the three and six months ended June 30, 2020 and 2019, stock-based compensation expense was reflected in the accompanying Condensed Consolidated Statements of Operations as follows: 
 Three Months Ended June 30,Six Months Ended June 30,
 2020201920202019
Patient care costs$171  $164  $383  $348  
General and administrative1,346  687  3,857  1,904  
Total stock-based compensation before tax$1,517  $851  $4,240  $2,252  
Schedule of assumptions used for options granted to acquire common stock and the fair value at the date of grant The assumptions used for options granted to acquire common stock during 2020 and the fair value at the date of grant under the 2016 Plan are noted in the following table:
 Six Months Ended June 30, 2020
Expected Volatility60%
Weighted average expected terms in years6.0
Weighted average risk-free interest rate0.94%
Expected annual dividend yield—%
Weighted average grant-date fair value$4.17
Schedule of information concerning options activity for options to acquire common stock
Information concerning options activity for options under all option plans to acquire common stock is summarized as follows:
 Six Months Ended June 30, 2020
Number
of options		Weighted-average
exercise price
Options outstanding as of January 1, 20204,803,146  $12.29  
Granted96,765  7.58  
Exercised(900,180) 1.41  
Forfeited/Canceled(163,935) 9.76  
Options outstanding as of June 30, 20203,835,796  $14.83  
Vested and expected to vest as of June 30, 20203,835,796  $14.83  
Exercisable as of June 30, 20202,393,293  $13.11  
Schedule of restricted stock award activity
A summary of restricted stock award activity is as follows: 
Six Months Ended June 30, 2020
Number of sharesWeighted-average grant date fair value per award
Unvested as of January 1, 2020579,283  $15.01  
Granted843,015  7.58  
Vested(223,196) 14.52  
Forfeited/Canceled(176,503) 9.75  
Unvested as of June 30, 20201,022,599  $9.41