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Stock Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Option, Unvested RSU Activity and Related Information (Detail) | The following table summarizes option and unvested RSU activity under the plans and related information:
|  | Shares Available for Grant |  |  | Stock Options Outstanding |  |  | Weighted- Average Exercise Price |  |  | Number of RSU Shares |  |  | Weighted- Average Grant Date Fair Value |
Balance—December 31, 2013 |  |  | 332,995 |  |  |  | 466,965 |  |  | $ | 1.99 |  |  |  | — |  |  | $ | — |
Additional options authorized |  |  | 940,884 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Restricted stock grants |  |  | (4,899 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Options granted |  |  | (585,345 | ) |  |  | 585,345 |  |  |  | 11.76 |  |  |  | — |  |  |  | — |
Assumed in business combination |  |  | — |  |  |  | 23,229 |  |  |  | 2.06 |  |  |  | — |  |  |  | — |
Options exercised |  |  | — |  |  |  | (9,363 | ) |  |  | 2.14 |  |  |  | — |  |  |  | — |
Options forfeited |  |  | 20,591 |  |  |  | (20,591 | ) |  |  | 10.36 |  |  |  | — |  |  |  | — |
Options expired |  |  | 13,781 |  |  |  | (13,781 | ) |  |  | 2.74 |  |  |  | — |  |  |  | — |
Balance—December 31, 2014 |  |  | 718,007 |  |  |  | 1,031,804 |  |  |  | 7.36 |  |  |  | — |  |  |  | — |
Additional options authorized |  |  | 357,075 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Restricted stock grants |  |  | (38,121 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
RSUs granted |  |  | (114,400 | ) |  |  | — |  |  |  | — |  |  |  | 114,400 |  |  |  | 6.49 |
Options granted |  |  | (652,078 | ) |  |  | 652,078 |  |  |  | 6.09 |  |  |  | — |  |  |  | — |
Options exercised |  |  | — |  |  |  | (23,576 | ) |  |  | 1.94 |  |  |  | — |  |  |  | — |
RSUs forfeited |  |  | 8,200 |  |  |  | — |  |  |  | — |  |  |  | (8,200 | ) |  |  | 6.49 |
Options forfeited |  |  | 77,660 |  |  |  | (77,660 | ) |  |  | 8.13 |  |  |  | — |  |  |  | — |
Options expired |  |  | 5,329 |  |  |  | (5,329 | ) |  |  | 10.36 |  |  |  | — |  |  |  | — |
Balance—December 31, 2015 |  |  | 361,672 |  |  |  | 1,577,317 |  |  |  | 6.87 |  |  |  | 106,200 |  |  |  | 6.49 |
Additional options authorized |  |  | 512,575 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Restricted stock grants |  |  | (61,921 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
RSUs granted |  |  | (287,900 | ) |  |  | — |  |  |  | — |  |  |  | 287,900 |  |  |  | 5.50 |
Options granted |  |  | (597,470 | ) |  |  | 597,470 |  |  |  | 4.91 |  |  |  | — |  |  |  | — |
Options exercised |  |  | — |  |  |  | (5,688 | ) |  |  | 3.29 |  |  |  | — |  |  |  | — |
RSUs forfeited |  |  | 61,305 |  |  |  | — |  |  |  | — |  |  |  | (61,305 | ) |  |  | 5.81 |
RSUs vested |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (26,550 | ) |  |  | 6.49 |
Options forfeited |  |  | 269,212 |  |  |  | (269,212 | ) |  |  | 6.64 |  |  |  | — |  |  |  | — |
Options expired |  |  | 107,601 |  |  |  | (107,601 | ) |  |  | 8.88 |  |  |  | — |  |  |  | — |
Balance—December 31, 2016 |  |  | 365,074 |  |  |  | 1,792,286 |  |  | $ | 6.15 |  |  |  | 306,245 |  |  | $ | 5.69 |
Vested at December 31, 2016 |  |  |  |  |  |  | 990,371 |  |  | $ | 6.05 |  |  |  |  |  |  |  |  |
Vested and expected to vest at December 31, 2016 |  |  |  |  |  |  | 1,757,309 |  |  | $ | 6.15 |  |  |  |  |  |  |  |  |
Schedule of Options Outstanding and Options Vested | Options outstanding and options vested as of December 31, 2016 are summarized as follows:
|  | Options Outstanding |  |  | Options Vested |
Range of Exercise Prices |  | Number of Options Outstanding |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Weighted Average Exercise Price |  |  | Number of Options Vested |  |  | Weighted Average Exercise Price |
$0.27 - 3.98 |  |  | 448,109 |  |  |  | 5.05 |  |  | $ | 2.04 |  |  |  | 415,570 |  |  | $ | 1.92 |
$4.37 - 4.60 |  |  | 179,263 |  |  |  | 9.15 |  |  |  | 4.47 |  |  |  | 18,064 |  |  |  | 4.46 |
$4.95 - 5.85 |  |  | 397,018 |  |  |  | 9.09 |  |  |  | 5.22 |  |  |  | 88,627 |  |  |  | 5.31 |
$6.49 - 7.03 |  |  | 384,910 |  |  |  | 8.18 |  |  |  | 6.64 |  |  |  | 189,136 |  |  |  | 6.64 |
$10.00 - 12.44 |  |  | 382,986 |  |  |  | 7.32 |  |  |  | 12.20 |  |  |  | 278,974 |  |  |  | 12.14 |
|  |  | 1,792,286 |  |  |  | 7.51 |  |  | $ | 6.14 |  |  |  | 990,371 |  |  | $ | 6.05 |
Summary of Options Outstanding and Exercisable Vested or Expected to Vest | Options outstanding that have vested and are expected to vest at December 31, 2016 are as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value (In thousands) |
Vested |  |  | 990,371 |  |  | $ | 6.05 |  |  |  | 6.55 |  |  | $ | 427 |
Expected to Vest |  |  | 766,938 |  |  |  | 6.28 |  |  |  | 8.70 |  |  |  | — |
Total |  |  | 1,757,309 |  |  | $ | 6.15 |  |  |  | 7.49 |  |  | $ | 427 |
Weighted-Average Assumptions Used to Fair Value of Share-Based Awards | The fair value of employee stock options and ESPP was estimated using the Black-Scholes Model using the following weighted-average assumptions.
|  | Year Ended December 31, |  |
|  | 2016 |  |  |  | 2015 |  |  |  | 2014 |  |
Employee Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  |  | 5.9 |  |  |  |  | 6.0 |  |  |  |  | 5.1 |  |
Expected volatility |  |  | 42.10 |  | % |  | 41.17 |  | % |  | 42.18 |  | %
Risk-free interest rate |  |  | 1.52 |  | % |  | 1.84 |  | % |  | 1.69 |  | %
Expected dividend yield |  | — |  | % |  | — |  | % |  | — |  | %
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  |  | 0.5 |  |  |  |  | 0.5 |  |  |  |  | — |  |
Expected volatility |  | 77.05 – 90.81 |  | % |  | 39.10 – 44.15 |  | % |  |  | — |  |
Risk-free interest rate |  | 0.37 – 0.49 |  | % |  |  | 0.11 |  | % |  |  | — |  |
Expected dividend yield |  | — |  | % |  | — |  | % |  | — |  | %
Summary of Expense Relating to Employee and Nonemployee Stock-Based Payment Awards from Stock Options and RSUs | The following table summarizes stock-based compensation expense relating to employee and nonemployee stock options, RSUs, and ESPP for the years ended December 31, 2016, 2015 and 2014, included in the statements of operations as follows (in thousands):
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Cost of testing |  | $ | 144 |  |  | $ | 109 |  |  | $ | 28 |
Research and development |  |  | 449 |  |  |  | 247 |  |  |  | 88 |
Sales and marketing |  |  | 156 |  |  |  | 173 |  |  |  | 29 |
General and administrative |  |  | 1,249 |  |  |  | 812 |  |  |  | 390 |
|  | $ | 1,998 |  |  | $ | 1,341 |  |  | $ | 535 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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