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CASH AND EQUIVALENTS AND MARKETABLE SECURITIES | 6 Months Ended
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Jun. 30, 2018
Cash and Equivalents and Marketable Securities Disclosure [Abstract] |
CASH AND EQUIVALENTS AND MARKETABLE SECURITIES | CASH AND CASH EQUIVALENTS AND MARKETABLE SECURITIES The Company considers all highly liquid, short-term debt instruments with original maturities of three months or less to be cash equivalents. Marketable debt securities consist primarily of commercial paper, medium-term corporate notes, and U.S. government and agency backed securities. The Company classifies these marketable debt securities as available-for-sale at fair value in “Marketable debt securities, at fair value”. The Company records the amortization of premium and accretion of discounts on marketable debt securities in the results of operations. The Company uses the specific identification method as a basis for determining cost and calculating realized gains and losses with respect to marketable debt securities. The gross gains and losses realized related to sales and maturities of marketable debt securities were not material during the three and six months ended June 30, 2018 and the year ended December 30, 2017. Investments in available-for-sale marketable debt securities are as follows at June 30, 2018 and December 30, 2017:
| Amortized Cost |  | Unrealized Losses |  | Fair Value
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
U.S. government and agency backed securities | $ | 23,827,644 |  |  | $ | 35,014,593 |  |  | $ | (409,130 | ) |  | $ | (288,782 | ) |  | $ | 23,418,514 |  |  | $ | 34,725,811 |
Corporate debt | 7,268,186 |  |  | 8,988,608 |  |  | (5,571 | ) |  | (7,702 | ) |  | 7,262,615 |  |  | 8,980,906 |
Certificates of deposit | — |  |  | 201,000 |  |  | — |  |  | (260 | ) |  | — |  |  | 200,740 |
Total | $ | 31,095,830 |  |  | $ | 44,204,201 |  |  | $ | (414,701 | ) |  | $ | (296,744 | ) |  | $ | 30,681,129 |  |  | $ | 43,907,457 |
The contractual maturity of the Company’s marketable debt securities is as follows at June 30, 2018:
| Less than One year |  | One to Five years |  | Greater than Five years |  | Total
U.S. government and agency backed securities | $ | 11,991,930 |  |  | $ | 11,426,584 |  |  | $ | — |  |  | $ | 23,418,514 |
Corporate debt | 1,042,161 |  |  | 6,220,454 |  |  | — |  |  | 7,262,615 |
Total | $ | 13,034,091 |  |  | $ | 17,647,038 |  |  | $ | — |  |  | $ | 30,681,129 |
The Company conducts a review of its marketable debt securities on a quarterly basis for the presence of other-than-temporary impairment ("OTTI"). The Company assesses whether OTTI is present when the fair value of a debt security is less than its amortized cost basis at the balance sheet date. Under these circumstances OTTI is considered to have occurred if (1) the Company intends to sell the security before recovery of its amortized cost basis; (2) it is “more likely than not” the Company will be required to sell the security before recovery of its amortized cost basis; or (3) the present value of expected cash flows is not sufficient to recover the entire amortized cost basis. The Company further estimates the amount of OTTI resulting from a decline in the creditworthiness of the issuer (credit-related OTTI) and the amount of non credit-related OTTI. Non credit-related OTTI can be caused by such factors as market illiquidity. Credit-related OTTI is recognized in earnings while non credit-related OTTI on securities not expected to be sold is recognized in other comprehensive income (loss). The Company did not record OTTI for the three and six months ended June 30, 2018 and July 1, 2017.

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- Definition Cash and Equivalents and Marketable Securities Disclosure [Abstract] + References No definition available. + Details
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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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