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Stock-Based Compensation - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2017
Jun. 30, 2017
Jun. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock options issue or exercised     0
Unrecognized stock-based compensation cost   $ 4,153,000 $ 4,153,000
Recognition period start date     2017-07
Recognition period end date     2020-02
Restricted Stock Units (RSUs)      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of shares granted to employees 612,000   612,000
Vesting period of options granted 3 years    
Stock-based compensation expenses   461,000 $ 639,000
Restricted Stock Units (RSUs) | Vesting on First Anniversary      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation award vesting rights, Percentage 40.00%    
Restricted Stock Units (RSUs) | Vesting on Second Anniversary      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation award vesting rights, Percentage 30.00%    
Restricted Stock Units (RSUs) | Vesting on Third Anniversary      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation award vesting rights, Percentage 30.00%    
Stock Appreciation Rights (SARs)      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of shares granted to employees 700,000   700,000
Vesting period of options granted 3 years    
Share-based compensation expiration period 5 years    
Stock-based compensation expenses   461,000 $ 639,000
Stock Appreciation Rights (SARs) | Vesting on First Anniversary      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation award vesting rights, Percentage 40.00%    
Stock Appreciation Rights (SARs) | Vesting on Second Anniversary      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation award vesting rights, Percentage 30.00%    
Stock Appreciation Rights (SARs) | Vesting on Third Anniversary      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation award vesting rights, Percentage 30.00%    
Stock Options      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation expenses   $ 461,000 $ 639,000