Subsequent Events	3 Months Ended
Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Reverse Stock Split On April 12, 2018, the Company’s Board of Directors approved a one-for-five reverse stock split of its issued and outstanding shares of common and convertible preferred stock. The par value of the Company's common stock and the par value of the Company's convertible preferred stock were not adjusted as a result of the reverse stock split. Accordingly, all share and per share amounts for all periods presented in the accompanying financial statements and notes thereto have been retroactively adjusted, where applicable, to reflect this reverse stock split. The reverse stock split became effective on April 13, 2018. Initial Public Offering On April 30, 2018, the Company closed its IPO of 6.9 million shares of common stock at an initial price to the public of $16.00 per share, including 0.9 million shares of common stock pursuant to the exercise in full of the underwriters' option to purchase additional shares, resulting in aggregate estimated net proceeds to us of $100.3 million after deducting underwriting discounts and commissions and estimated offering costs. Immediately prior to the closing of the IPO on April 30, 2018, all of the outstanding shares of convertible preferred stock converted into 24.6 million shares of common stock. Termination of 2001 Stock Plan The Company granted options under its 2001 Plan until April 24, 2018, when the plan was terminated in connection with the adoption the Company’s 2018 Equity Incentive Plan. Accordingly, no shares are available for future issuance under this plan. The 2001 Plan continues to govern outstanding equity awards granted thereunder. Adoption of 2018 Equity Incentive Plan The Company’s 2018 Equity Incentive Plan (the “2018 Plan”) became effective on April 24, 2018. The 2018 Plan provides for the grant of incentive stock options, or ISOs, within the meaning of Section 422 of the Internal Revenue Code, to the Company’s employees or any of the Company’s subsidiaries’ employees, and for the grant of nonstatutory stock options, or NSOs, restricted stock, restricted stock units, stock appreciation rights, performance units and performance shares to employees, directors and consultants of the Company and the Company’s subsidiaries’ employees and consultants. A total of 3.4 million shares of common stock are reserved for issuance pursuant to the 2018 Plan. In addition, the shares reserved for issuance under the 2018 Plan also include shares subject to awards under the 2001 Plan that, on or after the termination of the 2001 Plan, expire or terminate and shares previously issued pursuant to the 2001 Plan, as applicable, that, on or after the termination of the 2001 Plan, are forfeited or repurchased by the Company (provided that the maximum number of shares that may be added to the 2018 Plan from the 2001 plan is 5.6 million shares). The number of shares available for issuance under the 2018 Plan also include an annual increase on the first day of each fiscal year beginning on January 1, 2019, equal to the least of: 3.4 million shares; five percent (5%) of the outstanding shares of common stock as of the last day of the immediately preceding fiscal year; or such other amount as the Board of Directors may determine. Adoption of 2018 Employee Stock Purchase Plan The Company’s Employee Stock Purchase Plan, or 2018 ESPP, became effective on April 24, 2018. A total of 0.9 million shares of common stock are available for sale under the ESPP. The number of shares of common stock that are available for sale under the ESPP also includes an annual increase on the first day of each fiscal year following the fiscal year in which the first offering period enrollment date (if any) occurs, equal to the least of: 0.9 million shares; two percent (2%) of the outstanding shares of common stock as of the last day of the immediately preceding fiscal year; or such other amount as the administrator may determine. No offerings have been authorized to date by the Board of Directors under the ESPP. Lease Extension On May 10, 2018, the Company entered into an amendment (the "Amendment") to a lease covering a portion of its Vancouver, Washington office space and production facility. The Amendment extends the original term of the lease to July 31, 2025, with an option to renew for an additional five years. Total commitments under this lease extension are approximately $1.9 million.

Subsequent Events

Reverse Stock Split

On April 12, 2018, the Company’s Board of Directors approved a one-for-five reverse stock split of its issued and outstanding shares of common and convertible preferred stock. The par value of the Company's common stock and the par value of the Company's convertible preferred stock were not adjusted as a result of the reverse stock split. Accordingly, all share and per share amounts for all periods presented in the accompanying financial statements and notes thereto have been retroactively adjusted, where applicable, to reflect this reverse stock split. The reverse stock split became effective on April 13, 2018.

Initial Public Offering

On April 30, 2018, the Company closed its IPO of 6.9 million shares of common stock at an initial price to the public of $16.00 per share, including 0.9 million shares of common stock pursuant to the exercise in full of the underwriters' option to purchase additional shares, resulting in aggregate estimated net proceeds to us of $100.3 million after deducting underwriting discounts and commissions and estimated offering costs. Immediately prior to the closing of the IPO on April 30, 2018, all of the outstanding shares of convertible preferred stock converted into 24.6 million shares of common stock.

Termination of 2001 Stock Plan

The Company granted options under its 2001 Plan until April 24, 2018, when the plan was terminated in connection with the adoption the Company’s 2018 Equity Incentive Plan. Accordingly, no shares are available for future issuance under this plan. The 2001 Plan continues to govern outstanding equity awards granted thereunder.

Adoption of 2018 Equity Incentive Plan

The Company’s 2018 Equity Incentive Plan (the “2018 Plan”) became effective on April 24, 2018. The 2018 Plan provides for the grant of incentive stock options, or ISOs, within the meaning of Section 422 of the Internal Revenue Code, to the Company’s employees or any of the Company’s subsidiaries’ employees, and for the grant of nonstatutory stock options, or NSOs, restricted stock, restricted stock units, stock appreciation rights, performance units and performance shares to employees, directors and consultants of the Company and the Company’s subsidiaries’ employees and consultants. A total of 3.4 million shares of common stock are reserved for issuance pursuant to the 2018 Plan. In addition, the shares reserved for issuance under the 2018 Plan also include shares subject to awards under the 2001 Plan that, on or after the termination of the 2001 Plan, expire or terminate and shares previously issued pursuant to the 2001 Plan, as applicable, that, on or after the termination of the 2001 Plan, are forfeited or repurchased by the Company (provided that the maximum number of shares that may be added to the 2018 Plan from the 2001 plan is 5.6 million shares). The number of shares available for issuance under the 2018 Plan also include an annual increase on the first day of each fiscal year beginning on January 1, 2019, equal to the least of: 3.4 million shares; five percent (5%) of the outstanding shares of common stock as of the last day of the immediately preceding fiscal year; or such other amount as the Board of Directors may determine.

Adoption of 2018 Employee Stock Purchase Plan

The Company’s Employee Stock Purchase Plan, or 2018 ESPP, became effective on April 24, 2018. A total of 0.9 million shares of common stock are available for sale under the ESPP. The number of shares of common stock that are available for sale under the ESPP also includes an annual increase on the first day of each fiscal year following the fiscal year in which the first offering period enrollment date (if any) occurs, equal to the least of: 0.9 million shares; two percent (2%) of the outstanding shares of common stock as of the last day of the immediately preceding fiscal year; or such other amount as the administrator may determine. No offerings have been authorized to date by the Board of Directors under the ESPP.

Lease Extension

On May 10, 2018, the Company entered into an amendment (the "Amendment") to a lease covering a portion of its Vancouver, Washington office space and production facility. The Amendment extends the original term of the lease to July 31, 2025, with an option to renew for an additional five years. Total commitments under this lease extension are approximately $1.9 million.