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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property & Equipment, Patent Costs and Intangibles (Details) |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 15, 2017 USD ($) | Aug. 01, 2017 USD ($) | Mar. 31, 2018 USD ($) item | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Apr. 25, 2017 USD ($)
Property, plant and equipment |  |  |  |  |  |  |  |
Property, plant and equipment, gross |  |  | $ 145,691,000 |  |  | $ 118,072,000 |  |
Less-Accumulated depreciation |  |  | (42,243,000) |  |  | (38,086,000) |  |
Property, plant and equipment, net |  |  | 103,448,000 |  |  | 79,986,000 |  |
Assets under construction |  |  | 50,900,000 |  |  |  |  |
Impairment of long-lived assets |  |  | $ 0 |  |  | 0 |  |
Software Capitalization Policy |  |  |  |  |  |  |  |
Software development stages | item |  |  | 3 |  |  |  |  |
Patent Costs and Intangible Assets |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  | $ 23,660,000 |  |  | 23,660,000 |  |
Less: Accumulated amortization |  |  | (2,102,000) |  |  | (1,500,000) |  |
Total |  |  | 21,558,000 |  | $ 21,558,000 | 22,160,000 |  |
Amortization expense over remaining useful life |  |  |  |  |  |  |  |
2018 |  |  |  |  | 1,805,000 |  |  |
2019 |  |  |  |  | 2,407,000 |  |  |
2020 |  |  |  |  | 2,407,000 |  |  |
2021 |  |  |  |  | 2,373,000 |  |  |
2022 |  |  |  |  | 2,370,000 |  |  |
Thereafter |  |  |  |  | 10,196,000 |  |  |
Total |  |  | 21,558,000 |  | 21,558,000 | 22,160,000 |  |
Accrued liabilities |  |  | 56,716,000 |  |  | 49,126,000 |  |
Amortization of intangible assets |  |  | 612,000 | $ 50,000 |  |  |  |
Impairment losses |  |  | 0 |  |  |  |  |
Sampleminded Inc |  |  |  |  |  |  |  |
Patent Costs and Intangible Assets |  |  |  |  |  |  |  |
Total |  |  | 900,000 |  |  | 900,000 |  |
Amortization expense over remaining useful life |  |  |  |  |  |  |  |
Total |  |  | 900,000 |  |  | 900,000 |  |
Amortization of intangible assets |  |  | 36,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | $ 1,000,000 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 2,000,000 |
Licensed intellectual property and patents |  |  |  |  |  |  |  |
Patent Costs and Intangible Assets |  |  |  |  |  |  |  |
Total |  |  |  |  | $ 20,675,000 |  |  |
Estimated useful life |  |  |  |  | 10 years 2 months 12 days |  |  |
Amortization expense over remaining useful life |  |  |  |  |  |  |  |
Total |  |  |  |  | $ 20,675,000 |  |  |
Amortization of intangible assets |  |  | 300,000 | $ 50,000 |  |  |  |
Developed Technology |  |  |  |  |  |  |  |
Patent Costs and Intangible Assets |  |  |  |  |  |  |  |
Total |  |  |  |  | $ 883,000 |  |  |
Estimated useful life |  |  |  |  | 7 years 3 months 18 days |  |  |
Amortization expense over remaining useful life |  |  |  |  |  |  |  |
Total |  |  |  |  | $ 883,000 |  |  |
Developed Technology | Sampleminded Inc |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |
Estimated Useful Life |  | 8 years |  |  |  |  |  |
Amortization expense over remaining useful life |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | $ 900,000 |  |  |  |  |  |
Customer Relationships | Sampleminded Inc |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |
Estimated Useful Life |  | 3 years |  |  |  |  |  |
Amortization expense over remaining useful life |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | $ 100,000 |  |  |  |  |  |
Noncompete Agreements | Sampleminded Inc |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |
Estimated Useful Life |  | 5 years |  |  |  |  |  |
Amortization expense over remaining useful life |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | $ 32,000 |  |  |  |  |  |
Armune | Licensed intellectual property and patents |  |  |  |  |  |  |  |
Patent Costs and Intangible Assets |  |  |  |  |  |  |  |
Total |  |  | 12,000,000 |  |  | 12,200,000 |  |
Amortization expense over remaining useful life |  |  |  |  |  |  |  |
Total |  |  | 12,000,000 |  |  | 12,200,000 |  |
Amortization of intangible assets |  |  | 40,000 |  |  |  |  |
Land |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |
Property, plant and equipment, gross |  |  | 4,466,000 |  |  | 4,466,000 |  |
Leasehold and building improvements |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |
Property, plant and equipment, gross |  |  | 17,452,000 |  |  | 17,629,000 |  |
Assets under construction |  |  | 32,900,000 |  |  |  |  |
Expected cost to complete project |  |  | 239,200,000 |  |  |  |  |
Land improvements |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |
Property, plant and equipment, gross |  |  | $ 1,419,000 |  |  | $ 1,419,000 |  |
Estimated Useful Life |  |  | 15 years |  |  | 15 years |  |
Buildings |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |
Property, plant and equipment, gross |  |  | $ 7,928,000 |  |  | $ 7,928,000 |  |
Estimated Useful Life |  |  | 30 years |  |  | 30 years |  |
Computer equipment and computer software |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |
Property, plant and equipment, gross |  |  | $ 32,716,000 |  |  | $ 30,148,000 |  |
Estimated Useful Life |  |  | 3 years |  |  | 3 years |  |
Assets under construction |  |  | $ 1,700,000 |  |  |  |  |
Expected cost to complete project |  |  | 1,600,000 |  |  |  |  |
Laboratory equipment |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |
Property, plant and equipment, gross |  |  | 26,234,000 |  |  | $ 23,296,000 |  |
Assets under construction |  |  | 16,300,000 |  |  |  |  |
Expected cost to complete project |  |  | $ 16,000,000 |  |  |  |  |
Laboratory equipment | Minimum |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |
Estimated Useful Life |  |  | 3 years |  |  | 3 years |  |
Laboratory equipment | Maximum |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |
Estimated Useful Life |  |  | 5 years |  |  | 5 years |  |
Furniture and fixtures |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |
Property, plant and equipment, gross |  |  | $ 4,554,000 |  |  | $ 4,531,000 |  |
Estimated Useful Life |  |  | 3 years |  |  | 3 years |  |
Assets under construction |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |
Property, plant and equipment, gross |  |  | $ 50,922,000 |  |  | $ 28,655,000 |  |
Royalty Buy-Out Agreement | MDx |  |  |  |  |  |  |  |
Amortization expense over remaining useful life |  |  |  |  |  |  |  |
One-time fee for a royalty-free, fully-paid, perpetual and assignable license to patents |  |  |  |  |  |  |  | $ 8,000,000
Payment for the assignment of certain other patent rights which were not covered by the original agreement |  |  |  |  |  |  |  | 7,000,000
Total payment under second amendment to license agreement |  |  |  |  |  |  |  | 15,000,000
Current liabilities related to the second amendment to the license agreement |  |  |  |  |  |  |  | $ 6,600,000
Royalty Buy-Out Agreement | MDx | Licensed intellectual property and patents |  |  |  |  |  |  |  |
Patent Costs and Intangible Assets |  |  |  |  |  |  |  |
Total |  |  | 8,700,000 |  |  | 9,000,000 |  |
Amortization expense over remaining useful life |  |  |  |  |  |  |  |
Total |  |  | $ 8,700,000 |  |  | $ 9,000,000 |  |
Asset Purchase Agreement | Armune | Licensed intellectual property and patents |  |  |  |  |  |  |  |
Amortization expense over remaining useful life |  |  |  |  |  |  |  |
Purchases of intangible assets | $ 12,000,000 |  |  |  |  |  |  |
Contingent payment obligations | 17,500,000 |  |  |  |  |  |  |
Intangible asset acquired | $ 12,200,000 |  |  |  |  |  |  |

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