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Organization and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 29, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Estimated Useful Lives of Property and Equipment | Property and equipment are recorded at cost and depreciated using the straight-line method over the following estimated useful lives once it is placed into service:
Asset Category |  | Estimated Useful Life
Buildings |  | 40 years
Lab equipment |  | 5 years
Furniture and fixtures |  | 5 years
Computer equipment and software |  | 3 years
Leasehold improvements |  | 7 to 15 years
Reserve Balances for Discounts and Allowances | The activities and ending reserve balances for each significant category of discount and allowance were as follows (dollars in thousands):
| Chargebacks and discounts for prompt payment |  | Other customer credits/fees and co-pay assistance |  | Rebates |  | Returns |  | Total
Balance at December 31, 2015 | $ | 119 |  |  | $ | 251 |  |  | $ | 891 |  |  | $ | 38 |  |  | $ | 1,299 |
Provision related to sales made in: |  |  |  |  |  |  |  |  | — |
Current period | 8,271 |  |  | 2,747 |  |  | 5,105 |  |  | 359 |  |  | 16,482 |
Prior periods | (39 | ) |  | 2 |  |  | (313 | ) |  | (8 | ) |  | (358 | )
Payments and customer credits issued | (6,549 | ) |  | (2,206 | ) |  | (3,056 | ) |  | (38 | ) |  | (11,849 | )
Balance at December 31, 2016 | 1,802 |  |  | 794 |  |  | 2,627 |  |  | 351 |  |  | 5,574 |
Provision related to sales made in: |  |  |  |  |  |  |  |  |
Current period | 33,310 |  |  | 7,301 |  |  | 14,390 |  |  | — |  |  | 55,001 |
Prior periods | (817 | ) |  | — |  |  | (624 | ) |  | — |  |  | (1,441 | )
Payments and customer credits issued | (32,367 | ) |  | (6,300 | ) |  | (10,623 | ) |  | (351 | ) |  | (49,641 | )
Balance at December 31, 2017 | $ | 1,928 |  |  | $ | 1,795 |  |  | $ | 5,770 |  |  | $ | — |  |  | $ | 9,493 |

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- Definition Disclosure of accounting policy for revenue recognition for sales allowances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68073604&loc=d3e63113-111658 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.B.Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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