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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Option Valuation Assumptions
The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing formula that uses assumptions noted in the following table. Expected volatilities and risk-free interest rates are based upon the expected life of the grant.
 
Assumptions2018 2017 2016 
Expected dividends0 %0 %0 %
Risk free rate2.44 %1.56 %1.14 %
Expected volatility52.7%-72.5%58.0% - 69.7%68.0% - 71.3%
Expected term (in years)2.3 – 3.3 years3.2 – 3.3 years3.1 – 3.3 years
Schedule of Stock Option Transactions Stock option transactions in each of the past three years under the aforementioned plans in total were: 
 SharesExercise
Price Per Share		Weighted
Average
Exercise
Price
January 1, 2016 shares issuable under options3,592,734 $0.79 - $10.67$4.36 
Granted739,135 4.72 - 8.817.26 
Exercised(61,834)1.10 - 6.511.54 
Expired— — — 
Forfeited(164,666)4.55 – 10.678.37 
December 31, 2016 shares issuable under options4,105,369 $0.79 - $10.67$4.76 
Granted577,845 3.38 - 9.287.15 
Exercised(171,566)0.79 - 5.851.92 
Expired— — — 
Forfeited(211,838)4.80 - 10.677.70 
December 31, 2017 shares issuable under options4,299,810 $0.79 - $10.67$5.09 
Granted839,785 1.73-4.253.34 
Exercised(239,000)1.02-1.831.05 
Expired— — — 
Forfeited(548,204)2.02-10.678.04 
December 31, 2018 shares issuable under options4,352,391 $0.79-$10.67$4.61 
Schedule of Outstanding and Exercisable Stock Options
The following table summarizes information concerning outstanding and exercisable options as of December 31, 2018:

 Options OutstandingOptions Exercisable
Range of
Exercise Price		Number of
Options		Weighted
Average
Remaining
Life (Years )		Weighted
Average
Exercise
Price		Number of
Options		Weighted
Average
Exercise
Price
$0.79 - $1.501,510,000 3.12$1.06 1,510,000 $1.06 
$1.51 - $5.50992,457 8.273.23 199,826 2.76 
$5.51 - $10.671,849,934 6.998.24 1,528,686 8.45 
Total4,352,391 5.94$4.61 3,238,512 $4.65 
 
The following table summarizes information concerning outstanding and exercisable options as of December 31, 2017:
 
 Options OutstandingOptions Exercisable
Range of
Exercise Price		Number of
Options		Weighted
Average
Remaining
Life (Years )		Weighted
Average
Exercise
Price		Number of
Options		Weighted
Average
Exercise
Price
$0.79 - $1.0025,000 2.01$0.79 25,000 $0.79 
$1.01 - $1.501,721,000 4.141.06 1,721,000 1.06 
$1.51 - $10.672,553,810 7.767.85 1,369,466 7.92 
Total4,299,810 6.28$5.09 3,115,466 $4.07 

The following table summarizes information concerning outstanding and exercisable options as of December 31, 2016: 
 Options OutstandingOptions Exercisable
Range of
Exercise Price		Number of
Options		Weighted
Average
Remaining
Life (Years )		Weighted
Average
Exercise
Price		Number of
Options		Weighted
Average
Exercise
Price
$0.79 - $1.0050,000 3.01$0.79 50,000 $0.79 
$1.01 - $1.501,808,400 5.111.07 1,808,400 1.07 
$1.51 - $10.672,246,969 8.357.82 805,803 7.15 
Total4,105,369 6.86$4.76 2,664,203 $2.90 
Nonvested Stock Option Activity
A summary of non-vested options at December 31, 2018 and changes during the year ended December 31, 2018 is presented below: 
OptionsWeighted
Average
Grant Date
Fair Value
Non-vested options at January 1, 20181,184,344 $3.48 
Granted839,785 1.44 
Vested(699,572)3.54 
Forfeited(210,678)3.37 
Non-vested options at December 31, 20181,113,879 $2.00 
Schedule of Nonvested Shares of Restricted Stock A summary of non-vested RSUs and changes during each of the past three years is as follows:
Number of
RSUs		Weighted Average
Issuance Price
Non-vested balance at January 1, 2016182,750 $10.23 
Changes during the period:
Shares granted58,068 7.50 
Shares vested(60,918)10.13 
Shares forfeited— — 
Non-vested balance at December 31, 2016179,900 $9.35 
Changes during the period:
Shares granted93,468 7.26 
Shares vested(80,274)9.57 
Shares forfeited(4,465)7.09 
Non-vested balance at December 31, 2017188,629 $8.27 
Changes during the period:
Shares granted122,949 3.36 
Shares vested(109,940)8.95 
Shares forfeited(26,047)5.76 
Non-vested balance at December 31, 2018175,591 $4.78