Stock-Based Compensation - Summary of Stock-Based Compensation Expense for Stock Options Granted that was Recorded in the Company's Results of Operations (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
Stock-based compensation expense | ||
Stock-based compensation expense | $ 1,357 | $ 1,128 |
Cost of Product Revenue [Member] | ||
Stock-based compensation expense | ||
Stock-based compensation expense | 22 | 30 |
Research and Development [Member] | ||
Stock-based compensation expense | ||
Stock-based compensation expense | 369 | 302 |
Selling, General and Administrative [Member] | ||
Stock-based compensation expense | ||
Stock-based compensation expense | $ 966 | $ 796 |