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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Accounting Policies [Abstract] |
Summarized Financial Information of Equity Method Investments | Summarized financial data as of December 31, 2016 and 2015, and for the years ended December 31, 2016, 2015, and 2014, for the Company's equity method investments for which separate financial statements are not included, pursuant to SEC Regulation S-X Article 3-09, are shown in the following tables.
| December 31,
| 2016 |  | 2015
Current assets | $ | 77,761 |  |  | $ | 28,123 |
Non-current assets | 11,040 |  |  | 1,539 |
Total assets | 88,801 |  |  | 29,662 |
Current liabilities | 11,588 |  |  | 6,274 |
Net assets | $ | 77,213 |  |  | $ | 23,388 |
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
Revenues, net | $ | 417 |  |  | $ | 1,176 |  |  | $ | 940 |
Operating expenses | 62,373 |  |  | 32,513 |  |  | 17,289 |
Operating loss | (61,956 | ) |  | (31,337 | ) |  | (16,349 | )
Other, net | 1,535 |  |  | (64 | ) |  | 35 |
Net loss | $ | (60,421 | ) |  | $ | (31,401 | ) |  | $ | (16,314 | )
Rollforward of Allowance for Doubtful Receivable Accounts | The following table shows the activity in the allowance for doubtful receivable accounts for the years ended December 31, 2016 and 2015:
| 2016 |  | 2015
Beginning balance | $ | 2,081 |  |  | $ | 565 |
Charged to operating expenses | 1,963 |  |  | 1,757 |
Write offs of accounts receivable | (341 | ) |  | (241 | )
Ending balance | $ | 3,703 |  |  | $ | 2,081 |
Estimated Useful Lives of Property, Plant and Equipment | The estimated useful lives of these assets are as follows:
| Years
Land improvements | 4–20
Buildings and building improvements | 3–25
Furniture and fixtures | 1–10
Equipment | 1–10
Breeding stock | 1–4
Computer hardware and software | 1–7
Leasehold improvements are amortized over the shorter of the useful life of the asset or the applicable lease term, generally one to twenty years.
Summary of Assumptions Used in Option Pricing Model | The assumptions used in the Black-Scholes option pricing model for the years ended December 31, 2016, 2015 and 2014 are set forth in the table below:
| 2016 |  | 2015 |  | 2014
Valuation assumptions |  |  |  |  |
Expected dividend yield | 0% |  | 0% |  | 0%
Expected volatility | 59%—60% |  | 59%—62% |  | 62%—64%
Expected term (years) | 6.25 |  | 6.25 |  | 6.25
Risk-free interest rate | 1.23%—2.17% |  | 1.56%—1.95% |  | 1.82%—2.14%

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + 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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