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Stock Benefit Plans and Stock-Based Compensation - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2018
Sep. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for future issuance     39,438,000    
Stock-based compensation     $ 5,304,000 $ 3,981,000  
Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock issued       1,810,000  
Collaborative Arrangement | Elite Medical Holdings L L C And Pac3 Surgical Products L L C          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payments of settlement $ 400,000        
Gain Loss On Contract Termination     $ 6,200    
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for future issuance     4,682,000    
Weighted-average grant-date fair value of stock options granted     $ 2.00 $ 1.36  
Share price     $ 2.29    
Unrecognized compensation expense for stock options and awards expected to be recognized     $ 5,100,000    
Straight-line basis over a weighted average period     2 years 11 months 23 days    
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for future issuance     3,270,000    
Straight-line basis over a weighted average period     2 years 6 months 18 days    
Weighted average fair value of awards granted     $ 2.87 $ 2.96  
Unrecognized compensation expense for restricted stock and awards expected to be recognized     $ 7,200,000    
2016 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for future issuance   1,083,333      
Number of shares available for grant     711,933    
2016 Equity Incentive Plan | Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period   10 years      
Award vesting period   4 years      
Exercise price minimum percentage of market price on grant date   100.00%      
2016 Equity Incentive Plan | Employee Stock Option | 10 Percent Stockholder          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period   5 years      
Exercise price minimum percentage of market price on grant date   110.00%      
Inducement Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for future issuance     188,356    
Maximum award to be deductible other than options     $ 1,000,000    
Inducement Plan | PRSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity instruments other than options, grants in period, fair value         $ 800,000
Inducement Plan | PRSUs | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Target value, vesting percentage     0.00%    
Inducement Plan | PRSUs | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Target value, vesting percentage     250.00%    
Two Thousand Seventeen Distributor Inducement Plan | Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grant       75,000  
Number of warrants issued (in shares)       300,000  
Common stock issued       17,000  
Stock-based compensation       $ 200,000  
Number of warrants available to be granted       50,000  
Two Thousand Seventeen Distributor Inducement Plan | Board of Directors Chairman | Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share authorized grant of warrants       1,000,000  
2017 Development Services Plan | Board of Directors Chairman | Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share authorized grant of warrants     2,300,000 3,000,000  
Common stock issued     0    
Issuance of shares granted to distributors was vested     0