Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Stock-Based Compensation Expense (Details)

v3.20.1
Stockholders' Equity - Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2015
Class of Stock [Line Items]      
Stock-based compensation $ 4,206 $ 1,201  
2019 Plan      
Class of Stock [Line Items]      
Common stock authorized for issuance (in shares) 4,500,000    
2014 Stock Incentive Plan      
Class of Stock [Line Items]      
Common stock authorized for issuance (in shares)     2,113,637
Option award expiration date     10 years
Cost of Sales      
Class of Stock [Line Items]      
Stock-based compensation $ 357 154  
Research and Development Expense      
Class of Stock [Line Items]      
Stock-based compensation 200 215  
General and Administrative Expense      
Class of Stock [Line Items]      
Stock-based compensation $ 3,649 $ 832