Stockholders' Equity - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Stock-based compensation expense before income taxes | $ 2,447 | $ 4,117 |
| General and Administrative [Member] | ||
| Stock-based compensation expense before income taxes | 1,359 | 2,013 |
| Clinical, Regulatory and Research and Development [Member] | ||
| Stock-based compensation expense before income taxes | 327 | 471 |
| Sales and Marketing [Member] | ||
| Stock-based compensation expense before income taxes | $ 761 | $ 1,633 |