Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity and Stock Based Compensation - Vesting (Details)

v3.5.0.2
Stockholders' Equity and Stock Based Compensation - Vesting (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2016
installment
shares
Dec. 31, 2015
installment
shares
Dec. 31, 2014
installment
shares
Dec. 31, 2013
installment
shares
Dec. 31, 2012
installment
shares
Stock-based compensation          
Number of shares of common stock initially available for award 600,000        
Options reserved for future issuance (in shares) 305,463        
Restricted stock          
Stock-based compensation          
Granted (in shares) 171,252 44,000 98,689 56,500 92,000
Number of equal quarterly installments for vesting of awards | installment   16   20 20
Forfeited (in shares) 6,867 4,465 34,487 775 3,525
Restricted stock | Minimum          
Stock-based compensation          
Number of equal quarterly installments for vesting of awards | installment 1   1    
Restricted stock | Maximum          
Stock-based compensation          
Number of equal quarterly installments for vesting of awards | installment 20   20    
Restricted stock | CEO          
Stock-based compensation          
Granted (in shares)       40,000  
Number of equal quarterly installments for vesting of awards | installment       16