v3.3.1.900

Balance Sheet Components (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2015
Balance Sheet Components |
Schedule of allowance for doubtful accounts |
|  | December 31, |  | December 31, |
|  | 2015 |  | 2014 |
|  | (in thousands) |
Beginning balance |  | $ | 527 |  | $ | 508 |
Provision for estimated bad debts |  |  | 529 |  |  | 349 |
Write offs |  |  | (85) |  |  | (330) |
Ending balance |  | $ | 971 |  | $ | 527 |
Schedule of property and equipment |
|  |  |  | December 31, |  | December 31, |
|  | Useful Life |  | 2015 |  | 2014 |
|  |  |  | (in thousands) |
Machinery and equipment |  | 3-5 years |  | $ | 20,670 |  | $ | 18,632 |
Furniture and fixtures |  | 3 years |  |  | 217 |  |  | 217 |
Computer equipment |  | 3 years |  |  | 911 |  |  | 700 |
Capitalized software held for internal use |  | 3 years |  |  | 1,037 |  |  | — |
Leasehold improvements |  | Life of lease |  |  | 1,686 |  |  | 1,036 |
Construction-in-process |  |  |  |  | 1,979 |  |  | 3,583 |
|  |  |  |  | 26,500 |  |  | 24,168 |
Less: Accumulated depreciation and amortization |  |  |  |  | (13,790) |  |  | (9,594) |
Total Property and Equipment, net |  |  |  | $ | 12,710 |  | $ | 14,574 |
Schedule of accrued compensation |
|  | December 31, |  | December 31, |
|  | 2015 |  | 2014 |
|  | (in thousands) |
Accrued paid time off |  | $ | 2,024 |  | $ | 1,577 |
Accrued commissions |  |  | 3,691 |  |  | 2,651 |
Accrued bonuses |  |  | 1,348 |  |  | 1,141 |
Other accrued compensation |  |  | 1,489 |  |  | 611 |
Total accrued compensation |  | $ | 8,552 |  | $ | 5,980 |
Schedule of other accrued liabilities |
|  | December 31, |  | December 31, |
|  | 2015 |  | 2014 |
|  | (in thousands) |
Accrued expenses |  | $ | 17,870 |  | $ | 8,560 |
Accrued rent |  |  | 450 |  |  | 551 |
Deferred lease obligation |  |  | 42 |  |  | 99 |
Accrued interest |  |  | — |  |  | 764 |
Sales tax payable |  |  | 346 |  |  | 367 |
Total other accrued liabilities |  | $ | 18,708 |  | $ | 10,341 |

X
- Definition Tabular disclosure of the components of accrued compensation. + References No definition available. + Details
Name: | ntra_ScheduleOfAccruedCompensationTableTextBlock
Namespace Prefix: | ntra_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of other accrued liabilities. + References No definition available. + Details
Name: | ntra_ScheduleOfOtherAccruedLiabilitiesTableTextBlock
Namespace Prefix: | ntra_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_BalanceSheetRelatedDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
Name: | us-gaap_PropertyPlantAndEquipmentTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration