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Stockholders' Equity (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2016 USD ($) $ / shares shares | May 31, 2015 USD ($) | Apr. 30, 2015 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) vote $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($)
Common Stock |  |  |  |  |  |
Authorized shares of common stock |  |  |  | 125,000,000 | 125,000,000 |
Par value of shares of common stock (in dollars per share) | $ / shares |  |  |  | $ 0.001 | $ 0.001 |
Number of votes for each share of stock | vote |  |  |  | 1 |  |
Dividends declared | $ |  |  |  | $ 0 |  |
Options issued and outstanding (in shares) |  |  |  | 5,251,832 | 4,179,521 |
Shares available for issuance |  |  |  | 887,724 | 1,058,359 |
Total number of shares reserved for issuance |  |  |  | 6,748,609 | 5,987,880 |
Common stock, shares issued |  |  |  | 33,762,278 | 27,685,291 |
Net proceeds from sale of common stock in private placement | $ |  |  |  | $ 0 | $ 37,258,000 | $ 0
Options |  |  |  |  |  |
Common Stock |  |  |  |  |  |
Options issued and outstanding (in shares) |  |  |  | 5,251,832 | 4,179,521 |
Shares available for issuance |  |  |  | 887,724 | 1,058,359 |
ESPP |  |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Maximum offering period |  | 12 months |  |  |  |
Purchase period |  | 6 months |  |  |  |
Maximum fair market value of shares an employee can purchase per calendar year | $ |  | $ 25,000 |  |  |  |
Assumptions used to calculate estimated fair value of stock options using the Black-Scholes option-pricing valuation model |  |  |  |  |  |
Weighted-average volatility, low end of range (as a percent) |  |  |  | 46.38% | 53.57% |
Weighted-average volatility, high end of range (as a percent) |  |  |  | 75.72% | 58.10% |
Risk-free interest rate, low end of range (as a percent) |  |  |  | 0.40% | 0.17% |
Risk-free interest rate, high end of range (as a percent) |  |  |  | 0.50% | 0.33% |
ESPP | Minimum |  |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Minimum purchase price as a percentage of fair market value |  | 85.00% |  |  |  |
Assumptions used to calculate estimated fair value of stock options using the Black-Scholes option-pricing valuation model |  |  |  |  |  |
Weighted-average expected term |  |  |  | 6 months | 5 months 27 days |
ESPP | Maximum |  |  |  |  |  |
Assumptions used to calculate estimated fair value of stock options using the Black-Scholes option-pricing valuation model |  |  |  |  |  |
Weighted-average expected term |  |  |  | 1 year | 11 months 27 days |
Common Stock |  |  |  |  |  |
Common Stock |  |  |  |  |  |
Common stock, shares issued | 5,723,300 |  |  |  |  |
Shares issued, price per share (in usd per share) | $ / shares | $ 6.00 |  |  |  |  |
Sale of stock, consideration received on transaction, gross | $ | $ 34,300,000 |  |  |  |  |
Proceeds from issuance of common stock | $ | 32,100,000 |  |  |  |  |
Payments of stock issuance costs | $ | $ 2,200,000 |  |  |  |  |
Number of common stock issued and sold in private placement |  |  |  | 5,723,300 | 4,907,975 |
Share Price (in usd per share) | $ / shares |  |  |  | $ 7.74 | $ 7.20 |
Common Stock | Private placement |  |  |  |  |  |
Common Stock |  |  |  |  |  |
Number of common stock issued and sold in private placement |  |  | 4,907,975 |  |  |
Share Price (in usd per share) | $ / shares |  |  | $ 8.15 |  |  |
Gross proceeds from sale of common stock in private placement | $ |  |  | $ 40,000,000 |  |  |
Net proceeds from sale of common stock in private placement | $ |  |  | 37,300,000 |  |  |
Agent fees and other expenses | $ |  |  | $ 2,700,000 |  |  |
Common Stock | ESPP |  |  |  |  |  |
Common Stock |  |  |  |  |  |
Shares available for issuance |  |  |  | 609,053 | 750,000 |
Prepaid Expenses and Other Current Assets |  |  |  |  |  |
Common Stock |  |  |  |  |  |
Accounts receivable | $ |  |  |  | $ 200,000 |  |

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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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