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Related Party Transactions - Summary of Balances of Transactions with Related Parties (Parenthetical) (Detail) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
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Transactions with Third Party [Line Items] |  |  |
Accounts payable | [1] | $ 2,687,000 | $ 5,260,000
Other long-term liabilities | [1] | 14,000 | 45,000
Unvested Stock Options [Member] |  |  |
Transactions with Third Party [Line Items] |  |  |
Accounts payable |  | 32,000 | 200,000
Other long-term liabilities |  | $ 14,000 | $ 45,000
[1] | Includes an account payable of $32,000 and $0.2 million and a long-term liability of $14,000 and $45,000 for December 31, 2015 and 2014, respectively, related to the unvested portion of stock options as a result of the equitable adjustment approved by the Company's Board of Directors on December 18, 2012 that will be payable to executive officers and employees upon vesting of stock options.

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- Definition Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 5: 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.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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