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Stockholders' Equity (Narrative) (Details) | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2017 shares | Dec. 31, 2016 USD ($) item $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Feb. 02, 2017 USD ($) | May 18, 2016 USD ($) | Feb. 03, 2016 USD ($) | Feb. 03, 2015 USD ($) | Nov. 08, 2013 USD ($) | Feb. 28, 2013 $ / shares shares | Oct. 05, 2012 USD ($) | Oct. 31, 2010 $ / shares shares
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, shares authorized | shares |  | 1,000,000,000 | 1,000,000,000 |  |  |  |  |  |  |  |  | 1,000,000,000
Common Stock, par value | $ / shares |  | $ 0.001 | $ 0.001 |  |  |  |  |  |  |  |  | $ 0.001
Preferred Stock, shares authorized | shares |  | 50,000,000 | 50,000,000 |  |  |  |  |  |  |  |  | 50,000,000
Preferred Stock, par value | $ / shares |  | $ 0.001 | $ 0.001 |  |  |  |  |  |  |  |  | $ 0.001
Preferred Stock, shares issued | shares |  | 0 | 0 |  |  |  |  |  |  |  |  |
Preferred Stock, shares outstanding | shares |  | 0 | 0 |  |  |  |  |  |  |  |  |
Common stock, dividends declared | $ / shares |  | $ 0 |  |  |  |  |  |  |  |  |  |
Voting right of common stock share holders |  | one |  |  |  |  |  |  |  |  |  |
Voting right of common stock share holdes, number of votes | item |  | 1 |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  | $ 7,729,000 | $ 7,363,000 | $ 3,968,000 |  |  |  |  |  |  |  |
Number of warrants net exercised | shares |  | 5,500,000 |  |  |  |  |  |  |  |  |  |
Number of shares of common stock called by issuance of warrants | shares |  | 4,200,000 |  |  |  |  |  |  |  | 5,500,000 |  |
Aggregate exercise price of common stock called by issuance of warrants | $ / shares |  |  |  |  |  |  |  |  |  | $ 2.63 |  |
Number of shares of common stock called by issuance of warrants, outstanding | shares |  | 0 |  |  |  |  |  |  |  |  |  |
Number of equity compensation plans | item |  | 3 |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value outstanding |  | $ 7,300,000 |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value exercisable options |  | $ 6,300,000 |  |  |  |  |  |  |  |  |  |
Stock price | $ / shares |  | $ 3.80 |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life for exercisable |  | 5 years 7 months 13 days |  |  |  |  |  |  |  |  |  |
Vested and expected to vest, outstanding | shares |  | 19,636,962 |  |  |  |  |  |  |  |  |  |
Vested and expected to vest, aggregate intrinsic value |  | $ 6,900,000 |  |  |  |  |  |  |  |  |  |
Vested and expected to vest, weighted average exercise price | $ / shares |  | $ 6.17 |  |  |  |  |  |  |  |  |  |
Vested and expected to vest, weighted average remaining contractual life |  | 6 years 4 months 2 days |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised |  | $ 4,700,000 | 3,500,000 | 2,000,000 |  |  |  |  |  |  |  |
Fair value of options vested |  | 20,700,000 | 7,300,000 | 6,000,000 |  |  |  |  |  |  |  |
Stock-based compensation cost capitalized in inventory |  | 389,000 | 315,000 |  |  |  |  |  |  |  |  |
Stock-based compensation |  | $ 19,562,000 | $ 13,840,000 | $ 9,943,000 |  |  |  |  |  |  |  |
2010 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock option grant, term |  | 10 years |  |  |  |  |  |  |  |  |  |
Stock option grant, vest |  | 4 years |  |  |  |  |  |  |  |  |  |
Stock option grant, vest rate upon first anniversary |  | 25.00% |  |  |  |  |  |  |  |  |  |
Stock option grant, vest rate per month thereafter |  | 2.08% |  |  |  |  |  |  |  |  |  |
2010 Director Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock option grant, term |  | 10 years |  |  |  |  |  |  |  |  |  |
Stock option grant, vest rate upon first anniversary |  | 33.00% |  |  |  |  |  |  |  |  |  |
Stock option grant, vest rate per month thereafter |  | 2.78% |  |  |  |  |  |  |  |  |  |
2010 Director Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock option grant, vest |  | 1 year |  |  |  |  |  |  |  |  |  |
2010 Director Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock option grant, vest |  | 3 years |  |  |  |  |  |  |  |  |  |
2010 Plan and 2010 Director Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance | shares |  | 6,500,000 |  |  |  |  |  |  |  |  |  |
ESPP [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance | shares |  | 738,063 |  |  |  |  |  |  |  |  |  |
Percentage of outstanding common stock used to determine annual plan increase |  | 2.00% |  |  |  |  |  |  |  |  |  |
Number of purchase periods | item |  | 4 |  |  |  |  |  |  |  |  |  |
Purchase period of ESPP |  | 6 months |  |  |  |  |  |  |  |  |  |
Percentage of fair market value at which stock can be purchased |  | 85.00% |  |  |  |  |  |  |  |  |  |
Weighted average fair value at grant date | $ / shares |  | $ 4.21 | $ 2.20 | $ 2.98 |  |  |  |  |  |  |  |
Stock-based compensation |  | $ 3,700,000 | $ 3,600,000 | $ 2,100,000 |  |  |  |  |  |  |  |
Common stock purchased under plan | shares |  | 1,300,000 | 1,100,000 | 1,300,000 |  |  |  |  |  |  |  |
Cash received from option exercises |  | $ 5,200,000 | $ 4,400,000 | $ 2,300,000 |  |  |  |  |  |  |  |
At the Market Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock offering price shares |  |  |  |  |  | $ 30,000,000 | $ 30,000,000 | $ 30,000,000 | $ 30,000,000 |  | $ 30,000,000 |
Commissions |  | 3.00% |  |  |  |  |  |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life |  | 2 years 8 months 12 days |  |  |  |  |  |  |  |  |  |
Weighted average fair value at grant date | $ / shares |  | $ 5.47 | $ 4.75 | $ 3.81 |  |  |  |  |  |  |  |
Stock-based compensation |  | $ 15,700,000 | $ 10,200,000 | $ 7,800,000 |  |  |  |  |  |  |  |
Unrecognized compensation costs |  | 23,400,000 |  |  |  |  |  |  |  |  |  |
Cash received from option exercises |  | $ 2,500,000 | $ 3,000,000 | $ 1,600,000 |  |  |  |  |  |  |  |
Subsequent Event [Member] | 2010 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additional common stock reserved for issuance | shares | 4,600,000 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | ESPP [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additional common stock reserved for issuance | shares | 1,900,000 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | At the Market Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock offering price shares |  |  |  |  | $ 60,000,000 |  |  |  |  |  |  |
Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Holders may elect to receive net proceeds from financing activities, percentage |  | 25.00% |  |  |  |  |  |  |  |  |  |

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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + 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 (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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