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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Equity [Abstract] |
Schedule of Warrant Disclosures | As of December 31, 2016, the Company had outstanding warrants to purchase shares of common stock as follows (in thousands, except per share data):
Expiration Date |  | Exercise Price |  | Warrants Outstanding at December 31, 2016
October 2023 |  | $ | 5.76 |  |  | 13 |
February 2024 |  | $ | 10.12 |  |  | 119 |
Total |  |  |  | 132 |
The table below is a summary of the Company’s common stock warrant activity during the year ended December 31, 2016 (in thousands, except per share data).
|  | Shares |  | Weighted Average Exercise Price
Outstanding as of December 31, 2015 |  | 191 |  |  | $ | 9.96 |
Issued |  | — |  |  | — |
Exercised |  | — |  |  | — |
Canceled |  | (59 | ) | (1) | $ | 10.31 |
Outstanding as of December 31, 2016 |  | 132 |  |  | $ | 9.80 |
(1) In February 2016, warrants to purchase 59,288 shares of common stock issuable pertaining to the undrawn $10.0 million under the 2014 Loan and Security Agreement did not vest and were no longer exercisable, and were therefore canceled (See Note 6).
Schedule of Valuation Assumptions, Warrants |
|  | IPO Date April 3, 2014 |  | December 31, 2013 |
Fair value of Series A-2 preferred stock |  | $ | 1.75 |  | (1) | $ | 2.69 |  | (2)
Fair value of Series D-2 preferred stock |  | $ | 1.75 |  | (1) | $ | 2.81 |  | (2)
Fair value of common stock |  | $ | 7.00 |  | (1) | * |
Risk-free interest rate |  | 0.13% to 2.73% |  | 0.33% to 2.60% |
Expected life |  | Remaining contractual life |  | Remaining contractual life |
Expected dividends |  | — |  | — |
Volatility |  | 40% - 50% |  | 45 % |
(1) Fair value of the underlying stock is based on the Company's IPO price of $7.00 per share calculated on a pre-reverse split basis for preferred stock and post-reverse split basis for common stock.
(2) The per share data is on a pre-reverse split basis for preferred stock.
* There were no liability-classified common stock warrants at December 31, 2013.
Schedule of Common Stock Reserved for Future Issuance | As of December 31, 2016, shares of common stock reserved for future issuance related to outstanding equity awards, warrants, and employee equity incentive plans were as follows (in thousands):
|  | December 31, 2016
Stock options outstanding |  | 5,556 |
Restricted stock units outstanding |  | 2,019 |
Shares available for future grant under 2014 Plan |  | 6,095 |
Shares available for future issuance under ESPP |  | 1,102 |
Common stock warrants outstanding |  | 132 |
Total shares of common stock reserved |  | 14,904 |
Schedule of Stock Option Activities | A summary of the Company’s stock option activity during the year ended December 31, 2016 is as follows (in thousands, except years and per share data):
|  | Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value (1)
Outstanding as of December 31, 2015 |  | 6,092 |  |  | $ | 4.58 |  |  |  |  |
Options granted |  | 867 |  |  | 9.48 |  |  |  |  |
Options exercised |  | (982 | ) |  | 4.37 |  |  |  |  |
Options forfeited or expired |  | (421 | ) |  | 6.56 |  |  |  |  |
Outstanding as of December 31, 2016 |  | 5,556 |  |  | $ | 5.23 |  |  | 5.9 |  | $ | 49,895 |
Vested and expected to vest as of December 31, 2016 |  | 5,489 |  |  | 5.18 |  |  | 5.9 |  | 49,570 |
Exercisable as of December 31, 2016 |  | 4,065 |  |  | 4.13 |  |  | 5.0 |  | 40,996 |
(1) The aggregate intrinsic value amounts are computed based on the difference between the exercise price of the stock options and the fair market value of the Company’s common stock of $14.19 per share as of December 31, 2016 for all in-the-money stock options outstanding.
Following is additional information pertaining to the Company’s stock option activities (in thousands, except per share data):
|  | Year Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Weighted-average grant date fair value per share of options granted |  | $ | 4.50 |  |  | $ | 2.38 |  |  | $ | 3.42 |
Intrinsic value of options exercised (1) |  | 5,865 |  |  | 3,233 |  |  | 9,808 |
Proceeds received from options exercised |  | 4,286 |  |  | 1,268 |  |  | 1,127 |
(1) Intrinsic value of options exercised is the difference between the fair market value of the Company’s common stock at the time of exercise and the exercise price paid.
Schedule of RSU Activities | A summary of RSU activity during the year ended December 31, 2016 is as follows (in thousands, except years and per share data):
|  | Number of Shares |  | Weighted Average Grant Date Fair Value Per Share
Outstanding as of December 31, 2015 |  | 1,818 |  |  | $ | 5.01 |
RSUs granted |  | 1,308 |  |  | 9.71 |
RSUs vested and released |  | (896 | ) |  | 5.59 |
RSUs forfeited |  | (211 | ) |  | 6.47 |
Outstanding as of December 31, 2016 |  | 2,019 |  |  | $ | 7.65 |
Schedule of Stock-based Compensation Expense | Stock-based compensation expenses for the years ended December 31, 2016, 2015 and 2014 were as follows (in thousands):
|  | Year Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Cost of revenue |  | $ | 1,375 |  |  | $ | 866 |  |  | $ | 542 |
Research and development |  | 2,059 |  |  | 1,790 |  |  | 1,931 |
Sales and marketing |  | 2,363 |  |  | 1,800 |  |  | 1,510 |
General and administrative |  | 3,846 |  |  | 3,274 |  |  | 2,770 |
Total stock-based compensation |  | $ | 9,643 |  |  | $ | 7,730 |  |  | $ | 6,753 |
As of December 31, 2016, unrecognized stock-based compensation expense by award type, net of estimated forfeitures, and their expected weighted-average recognition periods are summarized in the following table (in thousands, except years).
|  | Stock Option |  | RSU |  | ESPP
Unrecognized stock-based compensation expense |  | $ | 5,722 |  |  | $ | 12,619 |  |  | $ | 409 |
Weighted-average amortization period |  | 2.4 years |  |  | 2.9 years |  |  | 0.4 years |
Schedule of Valuation Assumptions, Stock Option and ESPP | The weighted-average assumptions used to value stock options and purchase rights under the ESPP granted during the years ended December 31, 2016, 2015 and 2014 were as follows:
Stock Options |  | Year Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Expected term (years) |  | 5.7 |  | 6.1 |  | 6.1
Volatility |  | 46% |  | 49% |  | 55%
Risk-free interest rate |  | 1.4% |  | 1.6% |  | 1.8%
Dividend yield |  | — |  | — |  | —
ESPP |  | Granted In
|  | November 2016 |  | May 2016 |  | November 2015 |  | May 2015 |  | November 2014 |  | April 2014
Expected term (years) |  | 0.5 |  | 0.5 |  | 0.5 |  | 0.5 |  | 0.5 |  | 0.8
Volatility |  | 42% |  | 58% |  | 54% |  | 43% |  | 56% |  | 39%
Risk-free interest rate |  | 0.6% |  | 0.4% |  | 0.3% |  | 0.1% |  | 0.1% |  | 0.1%
Dividend yield |  | — |  | — |  | — |  | — |  | — |  | —

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51659978&loc=d3e25284-112666 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 + Details
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